diff --git a/beacon_chain/beacon_chain_db_immutable.nim b/beacon_chain/beacon_chain_db_immutable.nim
index 844aae95d..faf67a525 100644
--- a/beacon_chain/beacon_chain_db_immutable.nim
+++ b/beacon_chain/beacon_chain_db_immutable.nim
@@ -15,7 +15,7 @@ import
   ./spec/[eth2_ssz_serialization, eth2_merkleization]
 
 type
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#beaconstate
   # Memory-representation-equivalent to a phase0 BeaconState for in-place SSZ reading and writing
   Phase0BeaconStateNoImmutableValidators* = object
     # Versioning
@@ -66,7 +66,7 @@ type
     current_justified_checkpoint*: Checkpoint
     finalized_checkpoint*: Checkpoint
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#beaconstate
   # Memory-representation-equivalent to an Altair BeaconState for in-place SSZ
   # reading and writing
   AltairBeaconStateNoImmutableValidators* = object
diff --git a/beacon_chain/beacon_clock.nim b/beacon_chain/beacon_clock.nim
index d5aeecb8a..e8cbb672f 100644
--- a/beacon_chain/beacon_clock.nim
+++ b/beacon_chain/beacon_clock.nim
@@ -29,7 +29,7 @@ type
     ## which blocks are valid - in particular, blocks are not valid if they
     ## come from the future as seen from the local clock.
     ##
-    ## https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#fork-choice
+    ## https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#fork-choice
     ##
     # TODO consider NTP and network-adjusted timestamps as outlined here:
     #      https://ethresear.ch/t/network-adjusted-timestamps/4187
diff --git a/beacon_chain/consensus_object_pools/README.md b/beacon_chain/consensus_object_pools/README.md
index 30ffecd5a..5ff2ce887 100644
--- a/beacon_chain/consensus_object_pools/README.md
+++ b/beacon_chain/consensus_object_pools/README.md
@@ -7,9 +7,9 @@ to specs:
 - blocks: https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#beacon_block
 - aggregate attestations: https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
 - unaggregated attestation: https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
-- voluntary exits: https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#voluntary_exit
-- Attester slashings: https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#attester_slashing
-- Proposer slashings: https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#proposer_slashing
+- voluntary exits: https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#voluntary_exit
+- Attester slashings: https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#attester_slashing
+- Proposer slashings: https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#proposer_slashing
 
 After "gossip validation" the consensus objects can be rebroadcasted as they are optimistically good, however for internal processing further verification is needed.
 For blocks, this means verifying state transition and all contained cryptographic signatures (instead of just the proposer signature).
diff --git a/beacon_chain/consensus_object_pools/attestation_pool.nim b/beacon_chain/consensus_object_pools/attestation_pool.nim
index e58197a96..039f90392 100644
--- a/beacon_chain/consensus_object_pools/attestation_pool.nim
+++ b/beacon_chain/consensus_object_pools/attestation_pool.nim
@@ -564,7 +564,7 @@ proc getAttestationsForBlock*(pool: var AttestationPool,
                               cache: var StateCache): seq[Attestation] =
   ## Retrieve attestations that may be added to a new block at the slot of the
   ## given state
-  ## https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#attestations
+  ## https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#attestations
   let newBlockSlot = state.data.slot.uint64
 
   if newBlockSlot < MIN_ATTESTATION_INCLUSION_DELAY:
@@ -785,7 +785,7 @@ proc getBeaconHead*(
     finalizedExecutionPayloadHash =
       pool.dag.loadExecutionBlockRoot(pool.dag.finalizedHead.blck)
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/fork_choice/safe-block.md#get_safe_execution_payload_hash
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/fork_choice/safe-block.md#get_safe_execution_payload_hash
     safeBlockRoot = pool.forkChoice.get_safe_beacon_block_root()
     safeBlock = pool.dag.getBlockRef(safeBlockRoot)
     safeExecutionPayloadHash =
diff --git a/beacon_chain/consensus_object_pools/block_dag.nim b/beacon_chain/consensus_object_pools/block_dag.nim
index a36167240..e9fec3a24 100644
--- a/beacon_chain/consensus_object_pools/block_dag.nim
+++ b/beacon_chain/consensus_object_pools/block_dag.nim
@@ -129,7 +129,7 @@ func link*(parent, child: BlockRef) =
 func get_ancestor*(blck: BlockRef, slot: Slot,
     maxDepth = 100'i64 * 365 * 24 * 60 * 60 div SECONDS_PER_SLOT.int):
     BlockRef =
-  ## https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#get_ancestor
+  ## https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#get_ancestor
   ## Return the most recent block as of the time at `slot` that not more recent
   ## than `blck` itself
   if isNil(blck): return nil
diff --git a/beacon_chain/consensus_object_pools/block_pools_types.nim b/beacon_chain/consensus_object_pools/block_pools_types.nim
index f7589e779..c8d699b7b 100644
--- a/beacon_chain/consensus_object_pools/block_pools_types.nim
+++ b/beacon_chain/consensus_object_pools/block_pools_types.nim
@@ -240,7 +240,7 @@ type
       ## committee messages will be rejected
 
     optimisticRoots*: HashSet[Eth2Digest]
-      ## https://github.com/ethereum/consensus-specs/blob/v1.2.0/sync/optimistic.md#helpers
+      ## https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/sync/optimistic.md#helpers
 
   EpochKey* = object
     ## The epoch key fully determines the shuffling for proposers and
diff --git a/beacon_chain/consensus_object_pools/spec_cache.nim b/beacon_chain/consensus_object_pools/spec_cache.nim
index 8dd57812e..337dd8384 100644
--- a/beacon_chain/consensus_object_pools/spec_cache.nim
+++ b/beacon_chain/consensus_object_pools/spec_cache.nim
@@ -28,7 +28,7 @@ logScope: topics = "spec_cache"
 func count_active_validators*(shufflingRef: ShufflingRef): uint64 =
   shufflingRef.shuffled_active_validator_indices.lenu64
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_committee_count_per_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_committee_count_per_slot
 func get_committee_count_per_slot*(shufflingRef: ShufflingRef): uint64 =
   get_committee_count_per_slot(count_active_validators(shufflingRef))
 
@@ -41,7 +41,7 @@ func get_committee_index*(shufflingRef: ShufflingRef, index: uint64):
     Result[CommitteeIndex, cstring] =
   check_attestation_index(index, get_committee_count_per_slot(shufflingRef))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_beacon_committee
 iterator get_beacon_committee*(
     shufflingRef: ShufflingRef, slot: Slot, committee_index: CommitteeIndex):
     (int, ValidatorIndex) =
@@ -54,7 +54,7 @@ iterator get_beacon_committee*(
     committees_per_slot * SLOTS_PER_EPOCH
   ): yield (index_in_committee, idx)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_beacon_committee
 func get_beacon_committee*(
     shufflingRef: ShufflingRef, slot: Slot, committee_index: CommitteeIndex):
     seq[ValidatorIndex] =
@@ -67,7 +67,7 @@ func get_beacon_committee*(
     committees_per_slot * SLOTS_PER_EPOCH
   )
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_beacon_committee
 func get_beacon_committee_len*(
     shufflingRef: ShufflingRef, slot: Slot, committee_index: CommitteeIndex): uint64 =
   ## Return the number of members in the beacon committee at ``slot`` for ``index``.
@@ -79,7 +79,7 @@ func get_beacon_committee_len*(
     committees_per_slot * SLOTS_PER_EPOCH
   )
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_attesting_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_attesting_indices
 iterator get_attesting_indices*(shufflingRef: ShufflingRef,
                                 slot: Slot,
                                 committee_index: CommitteeIndex,
@@ -158,7 +158,7 @@ func get_attesting_indices_one*(shufflingRef: ShufflingRef,
     res = some(validator_index)
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_attesting_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_attesting_indices
 func get_attesting_indices*(shufflingRef: ShufflingRef,
                             slot: Slot,
                             committee_index: CommitteeIndex,
@@ -184,7 +184,7 @@ func makeAttestationData*(
 
   doAssert current_epoch == epochRef.epoch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#attestation-data
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#attestation-data
   AttestationData(
     slot: slot,
     index: committee_index.asUInt64,
@@ -194,7 +194,7 @@ func makeAttestationData*(
       epoch: current_epoch,
       root: epoch_boundary_block.blck.root))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#validator-assignments
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#validator-assignments
 iterator get_committee_assignments*(
     shufflingRef: ShufflingRef, validator_indices: HashSet[ValidatorIndex]):
     tuple[committee_index: CommitteeIndex,
diff --git a/beacon_chain/eth1/eth1_monitor.nim b/beacon_chain/eth1/eth1_monitor.nim
index 2cbbce02f..e1f2e4105 100644
--- a/beacon_chain/eth1/eth1_monitor.nim
+++ b/beacon_chain/eth1/eth1_monitor.nim
@@ -296,11 +296,11 @@ template toGaugeValue(x: Quantity): int64 =
 #  doAssert SECONDS_PER_ETH1_BLOCK * cfg.ETH1_FOLLOW_DISTANCE < GENESIS_DELAY,
 #             "Invalid configuration: GENESIS_DELAY is set too low"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#get_eth1_data
 func compute_time_at_slot(genesis_time: uint64, slot: Slot): uint64 =
   genesis_time + slot * SECONDS_PER_SLOT
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#get_eth1_data
 func voting_period_start_time(state: ForkedHashedBeaconState): uint64 =
   let eth1_voting_period_start_slot =
     getStateField(state, slot) - getStateField(state, slot) mod
@@ -308,7 +308,7 @@ func voting_period_start_time(state: ForkedHashedBeaconState): uint64 =
   compute_time_at_slot(
     getStateField(state, genesis_time), eth1_voting_period_start_slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#get_eth1_data
 func is_candidate_block(cfg: RuntimeConfig,
                         blk: Eth1Block,
                         period_start: uint64): bool =
@@ -859,7 +859,7 @@ template trackFinalizedState*(m: Eth1Monitor,
                               finalizedStateDepositIndex: uint64): bool =
   trackFinalizedState(m.depositsChain, finalizedEth1Data, finalizedStateDepositIndex)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#get_eth1_data
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#get_eth1_data
 proc getBlockProposalData*(chain: var Eth1Chain,
                            state: ForkedHashedBeaconState,
                            finalizedEth1Data: Eth1Data,
diff --git a/beacon_chain/eth1/merkle_minimal.nim b/beacon_chain/eth1/merkle_minimal.nim
index 703fd07a3..418cb6cd1 100644
--- a/beacon_chain/eth1/merkle_minimal.nim
+++ b/beacon_chain/eth1/merkle_minimal.nim
@@ -10,7 +10,7 @@ when (NimMajor, NimMinor) < (1, 4):
 else:
   {.push raises: [].}
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/utils/merkle_minimal.py
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/utils/merkle_minimal.py
 
 # Merkle tree helpers
 # ---------------------------------------------------------------
diff --git a/beacon_chain/fork_choice/fork_choice.nim b/beacon_chain/fork_choice/fork_choice.nim
index 7496371b3..600c06782 100644
--- a/beacon_chain/fork_choice/fork_choice.nim
+++ b/beacon_chain/fork_choice/fork_choice.nim
@@ -86,7 +86,7 @@ func extend[T](s: var seq[T], minLen: int) =
   if s.len < minLen:
     s.setLen(minLen)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#should_update_justified_checkpoint
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#should_update_justified_checkpoint
 func should_update_justified_checkpoint(
     self: var Checkpoints, dag: ChainDAGRef,
     new_justified_checkpoint: Checkpoint): FcResult[bool] =
@@ -140,7 +140,7 @@ proc update_justified(
   self.update_justified(dag, blck, justified.epoch)
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#on_block
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#on_block
 proc update_checkpoints(
     self: var Checkpoints, dag: ChainDAGRef,
     checkpoints: FinalityCheckpoints): FcResult[void] =
@@ -163,7 +163,7 @@ proc update_checkpoints(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#on_tick
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#on_tick
 proc on_tick(
     self: var ForkChoice, dag: ChainDAGRef, time: BeaconTime): FcResult[void] =
   ## Must be called at least once per slot.
@@ -292,7 +292,7 @@ proc on_attestation*(
       block_root: beacon_block_root))
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#on_attester_slashing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#on_attester_slashing
 func process_equivocation*(
        self: var ForkChoice,
        validator_index: ValidatorIndex
@@ -308,7 +308,7 @@ func process_equivocation*(
     trace "Integrating equivocation in fork choice",
       validator_index
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#on_block
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#on_block
 func process_block*(self: var ForkChoiceBackend,
                     block_root: Eth2Digest,
                     parent_root: Eth2Digest,
@@ -421,7 +421,7 @@ proc get_head*(self: var ForkChoice,
     self.checkpoints.justified.balances,
     self.checkpoints.proposer_boost_root)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/fork_choice/safe-block.md#get_safe_beacon_block_root
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/fork_choice/safe-block.md#get_safe_beacon_block_root
 func get_safe_beacon_block_root*(self: ForkChoice): Eth2Digest =
   # Use most recent justified block as a stopgap
   self.checkpoints.justified.checkpoint.root
diff --git a/beacon_chain/fork_choice/proto_array.nim b/beacon_chain/fork_choice/proto_array.nim
index b86718fb8..fb3499595 100644
--- a/beacon_chain/fork_choice/proto_array.nim
+++ b/beacon_chain/fork_choice/proto_array.nim
@@ -533,7 +533,7 @@ func nodeLeadsToViableHead(self: ProtoArray, node: ProtoNode): FcResult[bool] =
 
 func nodeIsViableForHead(self: ProtoArray, node: ProtoNode): bool =
   ## This is the equivalent of `filter_block_tree` function in eth2 spec
-  ## https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#filter_block_tree
+  ## https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#filter_block_tree
 
   if node.invalid:
     return false
diff --git a/beacon_chain/gossip_processing/README.md b/beacon_chain/gossip_processing/README.md
index 33528543d..9800dcfb0 100644
--- a/beacon_chain/gossip_processing/README.md
+++ b/beacon_chain/gossip_processing/README.md
@@ -12,9 +12,9 @@ Gossip validation is different from consensus verification in particular for blo
 - Blocks: https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#beacon_block
 - Attestations (aggregated): https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
 - Attestations (unaggregated): https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#attestation-subnets
-- Voluntary exits: https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#voluntary_exit
-- Proposer slashings: https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#proposer_slashing
-- Attester slashing: https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#attester_slashing
+- Voluntary exits: https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#voluntary_exit
+- Proposer slashings: https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#proposer_slashing
+- Attester slashing: https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#attester_slashing
 
 There are multiple consumers of validated consensus objects:
 - a `ValidationResult.Accept` output triggers rebroadcasting in libp2p
diff --git a/beacon_chain/gossip_processing/block_processor.nim b/beacon_chain/gossip_processing/block_processor.nim
index 355df0dac..c50711eb8 100644
--- a/beacon_chain/gossip_processing/block_processor.nim
+++ b/beacon_chain/gossip_processing/block_processor.nim
@@ -596,7 +596,7 @@ proc processBlock(
     # - MUST NOT optimistically import the block.
     # - MUST NOT apply the block to the fork choice store.
     # - MAY queue the block for later processing.
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/sync/optimistic.md#execution-engine-errors
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/sync/optimistic.md#execution-engine-errors
     await sleepAsync(chronos.seconds(1))
     self[].addBlock(
       entry.src, entry.blck, entry.resfut, entry.validationDur)
diff --git a/beacon_chain/gossip_processing/eth2_processor.nim b/beacon_chain/gossip_processing/eth2_processor.nim
index a69d0e64d..abb3c59aa 100644
--- a/beacon_chain/gossip_processing/eth2_processor.nim
+++ b/beacon_chain/gossip_processing/eth2_processor.nim
@@ -566,7 +566,7 @@ proc processSignedContributionAndProof*(
 
     err(v.error())
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
 proc processLightClientFinalityUpdate*(
     self: var Eth2Processor, src: MsgSource,
     finality_update: altair.LightClientFinalityUpdate
@@ -577,7 +577,7 @@ proc processLightClientFinalityUpdate*(
       self.lightClientPool[], self.dag, finality_update, wallTime)
   v
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#process_light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#process_light_client_optimistic_update
 proc processLightClientOptimisticUpdate*(
     self: var Eth2Processor, src: MsgSource,
     optimistic_update: altair.LightClientOptimisticUpdate
diff --git a/beacon_chain/gossip_processing/gossip_validation.nim b/beacon_chain/gossip_processing/gossip_validation.nim
index 634a0b69e..c32dcdc1c 100644
--- a/beacon_chain/gossip_processing/gossip_validation.nim
+++ b/beacon_chain/gossip_processing/gossip_validation.nim
@@ -94,7 +94,7 @@ func check_propagation_slot_range(
   let
     pastSlot = (wallTime - MAXIMUM_GOSSIP_CLOCK_DISPARITY).toSlot()
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#configuration
   # The spec value of ATTESTATION_PROPAGATION_SLOT_RANGE is 32, but it can
   # retransmit attestations on the cusp of being out of spec, and which by
   # the time they reach their destination might be out of spec.
@@ -180,7 +180,7 @@ template validateBeaconBlockBellatrix(
     parent: BlockRef): untyped =
   discard
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/p2p-interface.md#beacon_block
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/bellatrix/p2p-interface.md#beacon_block
 template validateBeaconBlockBellatrix(
        signed_beacon_block: bellatrix.SignedBeaconBlock,
        parent: BlockRef): untyped =
@@ -221,7 +221,7 @@ template validateBeaconBlockBellatrix(
   # `ACCEPTED` or `SYNCING` from the EL to get this far.
 
 # https://github.com/ethereum/consensus-specs/blob/v1.1.9/specs/phase0/p2p-interface.md#beacon_block
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/p2p-interface.md#beacon_block
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/bellatrix/p2p-interface.md#beacon_block
 proc validateBeaconBlock*(
     dag: ChainDAGRef, quarantine: ref Quarantine,
     signed_beacon_block: phase0.SignedBeaconBlock | altair.SignedBeaconBlock |
@@ -249,7 +249,7 @@ proc validateBeaconBlock*(
   # proposer for the slot, signed_beacon_block.message.slot.
   #
   # While this condition is similar to the proposer slashing condition at
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#proposer-slashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#proposer-slashing
   # it's not identical, and this check does not address slashing:
   #
   # (1) The beacon blocks must be conflicting, i.e. different, for the same
@@ -300,7 +300,7 @@ proc validateBeaconBlock*(
     if signed_beacon_block.message.parent_root in quarantine[].unviable:
       quarantine[].addUnviable(signed_beacon_block.root)
 
-      # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/p2p-interface.md#beacon_block
+      # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/bellatrix/p2p-interface.md#beacon_block
       # `is_execution_enabled(state, block.body)` check, but unlike in
       # validateBeaconBlockBellatrix() don't have parent BlockRef.
       if  signed_beacon_block.message.is_execution_block or
@@ -764,7 +764,7 @@ proc validateAggregate*(
 
   return ok((attesting_indices, sig))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#attester_slashing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#attester_slashing
 proc validateAttesterSlashing*(
     pool: ExitPool, attester_slashing: AttesterSlashing):
     Result[void, ValidationError] =
@@ -787,7 +787,7 @@ proc validateAttesterSlashing*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#proposer_slashing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#proposer_slashing
 proc validateProposerSlashing*(
     pool: ExitPool, proposer_slashing: ProposerSlashing):
     Result[void, ValidationError] =
@@ -840,7 +840,7 @@ proc validateVoluntaryExit*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/p2p-interface.md#sync_committee_subnet_id
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#sync_committee_subnet_id
 proc validateSyncCommitteeMessage*(
     dag: ChainDAGRef,
     batchCrypto: ref BatchCrypto,
@@ -1045,7 +1045,7 @@ proc validateContribution*(
 
   return ok((sig, participants))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
 proc validateLightClientFinalityUpdate*(
     pool: var LightClientPool, dag: ChainDAGRef,
     finality_update: altair.LightClientFinalityUpdate,
@@ -1073,7 +1073,7 @@ proc validateLightClientFinalityUpdate*(
   pool.latestForwardedFinalitySlot = finalized_slot
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
 proc validateLightClientOptimisticUpdate*(
     pool: var LightClientPool, dag: ChainDAGRef,
     optimistic_update: altair.LightClientOptimisticUpdate,
diff --git a/beacon_chain/gossip_processing/light_client_processor.nim b/beacon_chain/gossip_processing/light_client_processor.nim
index 88bd12a44..6bb46c633 100644
--- a/beacon_chain/gossip_processing/light_client_processor.nim
+++ b/beacon_chain/gossip_processing/light_client_processor.nim
@@ -431,7 +431,7 @@ func toValidationError(
       # `attested_header.slot` was already forwarded on the network.
       errIgnore($r.error)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
 proc processLightClientFinalityUpdate*(
     self: var LightClientProcessor, src: MsgSource,
     finality_update: altair.LightClientFinalityUpdate
@@ -444,7 +444,7 @@ proc processLightClientFinalityUpdate*(
     self.latestFinalityUpdate = finality_update.toOptimistic
   v
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
 proc processLightClientOptimisticUpdate*(
     self: var LightClientProcessor, src: MsgSource,
     optimistic_update: altair.LightClientOptimisticUpdate
diff --git a/beacon_chain/networking/eth2_network.nim b/beacon_chain/networking/eth2_network.nim
index 175708c5f..4ed56a488 100644
--- a/beacon_chain/networking/eth2_network.nim
+++ b/beacon_chain/networking/eth2_network.nim
@@ -174,7 +174,7 @@ type
   MounterProc* = proc(network: Eth2Node) {.gcsafe, raises: [Defect, CatchableError].}
   MessageContentPrinter* = proc(msg: pointer): string {.gcsafe, raises: [Defect].}
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#goodbye
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#goodbye
   DisconnectionReason* = enum
     # might see other values on the wire!
     ClientShutDown = 1
@@ -2230,8 +2230,8 @@ proc getPersistentNetKeys*(
 
 func gossipId(
     data: openArray[byte], phase0Prefix, topic: string): seq[byte] =
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#topics-and-messages
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#topics-and-messages
   const
     MESSAGE_DOMAIN_INVALID_SNAPPY = [0x00'u8, 0x00, 0x00, 0x00]
     MESSAGE_DOMAIN_VALID_SNAPPY = [0x01'u8, 0x00, 0x00, 0x00]
@@ -2496,7 +2496,7 @@ proc broadcast(node: Eth2Node, topic: string, msg: auto):
 
 proc subscribeAttestationSubnets*(
     node: Eth2Node, subnets: AttnetBits, forkDigest: ForkDigest) =
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#attestations-and-aggregation
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#attestations-and-aggregation
   # Nimbus won't score attestation subnets for now, we just rely on block and
   # aggregate which are more stable and reliable
 
@@ -2507,7 +2507,7 @@ proc subscribeAttestationSubnets*(
 
 proc unsubscribeAttestationSubnets*(
     node: Eth2Node, subnets: AttnetBits, forkDigest: ForkDigest) =
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#attestations-and-aggregation
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#attestations-and-aggregation
   # Nimbus won't score attestation subnets for now; we just rely on block and
   # aggregate which are more stable and reliable
 
@@ -2516,15 +2516,15 @@ proc unsubscribeAttestationSubnets*(
       node.unsubscribe(getAttestationTopic(forkDigest, SubnetId(subnet_id)))
 
 proc updateStabilitySubnetMetadata*(node: Eth2Node, attnets: AttnetBits) =
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#metadata
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#metadata
   if node.metadata.attnets == attnets:
     return
 
   node.metadata.seq_number += 1
   node.metadata.attnets = attnets
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#phase-0-attestation-subnet-stability
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#attestation-subnet-bitfield
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#phase-0-attestation-subnet-stability
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#attestation-subnet-bitfield
   let res = node.discovery.updateRecord({
     enrAttestationSubnetsField: SSZ.encode(node.metadata.attnets)
   })
@@ -2577,7 +2577,7 @@ proc broadcastAttestation*(
     node: Eth2Node, subnet_id: SubnetId, attestation: Attestation):
     Future[SendResult] =
   # Regardless of the contents of the attestation,
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/p2p-interface.md#transitioning-the-gossip
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#transitioning-the-gossip
   # implies that pre-fork, messages using post-fork digests might be
   # ignored, whilst post-fork, there is effectively a seen_ttl-based
   # timer unsubscription point that means no new pre-fork-forkdigest
diff --git a/beacon_chain/rpc/rest_config_api.nim b/beacon_chain/rpc/rest_config_api.nim
index 0c9554e40..ec17f13c1 100644
--- a/beacon_chain/rpc/rest_config_api.nim
+++ b/beacon_chain/rpc/rest_config_api.nim
@@ -22,7 +22,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
     cachedConfigSpec =
       RestApiResponse.prepareJsonResponse(
         (
-          # https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/phase0.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/phase0.yaml
           MAX_COMMITTEES_PER_SLOT:
             Base10.toString(MAX_COMMITTEES_PER_SLOT),
           TARGET_COMMITTEE_SIZE:
@@ -90,7 +90,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           MAX_VOLUNTARY_EXITS:
             Base10.toString(MAX_VOLUNTARY_EXITS),
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/altair.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/altair.yaml
           INACTIVITY_PENALTY_QUOTIENT_ALTAIR:
             Base10.toString(INACTIVITY_PENALTY_QUOTIENT_ALTAIR),
           MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR:
@@ -106,7 +106,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           UPDATE_TIMEOUT:
             Base10.toString(UPDATE_TIMEOUT),
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/bellatrix.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/bellatrix.yaml
           INACTIVITY_PENALTY_QUOTIENT_BELLATRIX:
             Base10.toString(INACTIVITY_PENALTY_QUOTIENT_BELLATRIX),
           MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX:
@@ -186,7 +186,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           DEPOSIT_CONTRACT_ADDRESS:
             $cfg.DEPOSIT_CONTRACT_ADDRESS,
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#constants
+          # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#constants
           # GENESIS_SLOT
           # GENESIS_EPOCH
           # FAR_FUTURE_EPOCH
@@ -213,7 +213,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
           DOMAIN_AGGREGATE_AND_PROOF:
             to0xHex(DOMAIN_AGGREGATE_AND_PROOF.data),
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#constants
+          # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#constants
           TIMELY_SOURCE_FLAG_INDEX:
             to0xHex([byte(TIMELY_SOURCE_FLAG_INDEX)]),
           TIMELY_TARGET_FLAG_INDEX:
@@ -240,7 +240,7 @@ proc installConfigApiHandlers*(router: var RestRouter, node: BeaconNode) =
             to0xHex(DOMAIN_CONTRIBUTION_AND_PROOF.data),
           # PARTICIPATION_FLAG_WEIGHTS
 
-          # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#constants
+          # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#constants
           TARGET_AGGREGATORS_PER_COMMITTEE:
             Base10.toString(TARGET_AGGREGATORS_PER_COMMITTEE),
           RANDOM_SUBNETS_PER_VALIDATOR:
diff --git a/beacon_chain/spec/beacon_time.nim b/beacon_chain/spec/beacon_time.nim
index fd4061346..ba4937e24 100644
--- a/beacon_chain/spec/beacon_time.nim
+++ b/beacon_chain/spec/beacon_time.nim
@@ -46,7 +46,7 @@ const
   GENESIS_SLOT* = Slot(0)
   GENESIS_EPOCH* = Epoch(0) # compute_epoch_at_slot(GENESIS_SLOT)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#constant
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#constant
   INTERVALS_PER_SLOT* = 3
 
   FAR_FUTURE_BEACON_TIME* = BeaconTime(ns_since_genesis: int64.high())
@@ -134,10 +134,10 @@ template `+`*(a: TimeDiff, b: Duration): TimeDiff =
 const
   # Offsets from the start of the slot to when the corresponding message should
   # be sent
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#attesting
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#attesting
   attestationSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#broadcast-aggregate
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#broadcast-aggregate
   aggregateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64  * 2 div INTERVALS_PER_SLOT)
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#prepare-sync-committee-message
@@ -146,10 +146,10 @@ const
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#broadcast-sync-committee-contribution
   syncContributionSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64  * 2 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#sync-committee
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#sync-committee
   lightClientFinalityUpdateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#sync-committee
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#sync-committee
   lightClientOptimisticUpdateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
 
@@ -183,13 +183,13 @@ func slotOrZero*(time: BeaconTime): Slot =
   if exSlot.afterGenesis: exSlot.slot
   else: Slot(0)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_epoch_at_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_epoch_at_slot
 func epoch*(slot: Slot): Epoch = # aka compute_epoch_at_slot
   ## Return the epoch number at ``slot``.
   if slot == FAR_FUTURE_SLOT: FAR_FUTURE_EPOCH
   else: Epoch(slot div SLOTS_PER_EPOCH)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#compute_slots_since_epoch_start
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#compute_slots_since_epoch_start
 func since_epoch_start*(slot: Slot): uint64 = # aka compute_slots_since_epoch_start
   ## How many slots since the beginning of the epoch (`[0..SLOTS_PER_EPOCH-1]`)
   (slot mod SLOTS_PER_EPOCH)
@@ -197,14 +197,14 @@ func since_epoch_start*(slot: Slot): uint64 = # aka compute_slots_since_epoch_st
 template is_epoch*(slot: Slot): bool =
   slot.since_epoch_start == 0
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_start_slot_at_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_start_slot_at_epoch
 func start_slot*(epoch: Epoch): Slot = # aka compute_start_slot_at_epoch
   ## Return the start slot of ``epoch``.
   const maxEpoch = Epoch(FAR_FUTURE_SLOT div SLOTS_PER_EPOCH)
   if epoch >= maxEpoch: FAR_FUTURE_SLOT
   else: Slot(epoch * SLOTS_PER_EPOCH)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_previous_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_previous_epoch
 func get_previous_epoch*(current_epoch: Epoch): Epoch =
   ## Return the previous epoch (unless the current epoch is ``GENESIS_EPOCH``).
   if current_epoch == GENESIS_EPOCH:
diff --git a/beacon_chain/spec/crypto.nim b/beacon_chain/spec/crypto.nim
index ce78ab945..17fc565b7 100644
--- a/beacon_chain/spec/crypto.nim
+++ b/beacon_chain/spec/crypto.nim
@@ -96,7 +96,7 @@ export
 
 # API
 # ----------------------------------------------------------------------
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#bls-signatures
 
 func toPubKey*(privkey: ValidatorPrivKey): CookedPubKey =
   ## Derive a public key from a private key
@@ -204,7 +204,7 @@ func finish*(agg: AggregateSignature): CookedSig {.inline.} =
   sig.finish(agg)
   CookedSig(sig)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#bls-signatures
 func blsVerify*(
     pubkey: CookedPubKey, message: openArray[byte],
     signature: CookedSig): bool =
@@ -217,7 +217,7 @@ func blsVerify*(
   ## to enforce correct usage.
   PublicKey(pubkey).verify(message, blscurve.Signature(signature))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#bls-signatures
 proc blsVerify*(
     pubkey: ValidatorPubKey, message: openArray[byte],
     signature: CookedSig): bool =
diff --git a/beacon_chain/spec/datatypes/base.nim b/beacon_chain/spec/datatypes/base.nim
index d1742d8f5..4ad704683 100644
--- a/beacon_chain/spec/datatypes/base.nim
+++ b/beacon_chain/spec/datatypes/base.nim
@@ -85,7 +85,7 @@ const
   ZERO_HASH* = Eth2Digest()
   MAX_GRAFFITI_SIZE* = 32
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#configuration
   MAXIMUM_GOSSIP_CLOCK_DISPARITY* = 500.millis
 
   SLOTS_PER_ETH1_VOTING_PERIOD* =
@@ -129,7 +129,7 @@ template maxSize*(n: int) {.pragma.}
 # - broke the compiler in SSZ and nim-serialization
 
 type
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#custom-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#custom-types
   Eth2Domain* = array[32, byte]
 
   ValidatorIndex* = distinct uint32
@@ -176,7 +176,7 @@ type
   # SSZ / hashing purposes
   JustificationBits* = distinct uint8
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#proposerslashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#proposerslashing
   ProposerSlashing* = object
     signed_header_1*: SignedBeaconBlockHeader
     signed_header_2*: SignedBeaconBlockHeader
@@ -188,7 +188,7 @@ type
     signed_header_1*: TrustedSignedBeaconBlockHeader
     signed_header_2*: TrustedSignedBeaconBlockHeader
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#attesterslashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#attesterslashing
   AttesterSlashing* = object
     attestation_1*: IndexedAttestation
     attestation_2*: IndexedAttestation
@@ -200,7 +200,7 @@ type
     attestation_1*: TrustedIndexedAttestation
     attestation_2*: TrustedIndexedAttestation
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#indexedattestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#indexedattestation
   IndexedAttestation* = object
     attesting_indices*: List[uint64, Limit MAX_VALIDATORS_PER_COMMITTEE]
     data*: AttestationData
@@ -216,7 +216,7 @@ type
 
   CommitteeValidatorsBits* = BitList[Limit MAX_VALIDATORS_PER_COMMITTEE]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#attestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#attestation
   Attestation* = object
     aggregation_bits*: CommitteeValidatorsBits
     data*: AttestationData
@@ -232,17 +232,17 @@ type
 
   ForkDigest* = distinct array[4, byte]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#forkdata
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#forkdata
   ForkData* = object
     current_version*: Version
     genesis_validators_root*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#checkpoint
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#checkpoint
   Checkpoint* = object
     epoch*: Epoch
     root*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#AttestationData
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#AttestationData
   AttestationData* = object
     slot*: Slot
 
@@ -255,20 +255,20 @@ type
     source*: Checkpoint
     target*: Checkpoint
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#deposit
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#deposit
   Deposit* = object
     proof*: array[DEPOSIT_CONTRACT_TREE_DEPTH + 1, Eth2Digest]
       ## Merkle path to deposit root
 
     data*: DepositData
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#depositmessage
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#depositmessage
   DepositMessage* = object
     pubkey*: ValidatorPubKey
     withdrawal_credentials*: Eth2Digest
     amount*: Gwei
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#depositdata
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#depositdata
   DepositData* = object
     pubkey*: ValidatorPubKey
     withdrawal_credentials*: Eth2Digest
@@ -277,7 +277,7 @@ type
     # if the deposit should be added or not during processing
     signature*: ValidatorSig  # Signing over DepositMessage
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#voluntaryexit
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#voluntaryexit
   VoluntaryExit* = object
     epoch*: Epoch
       ## Earliest epoch when voluntary exit can be processed
@@ -305,7 +305,7 @@ type
     pubkey*: CookedPubKey
     withdrawal_credentials*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#validator
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#validator
   Validator* = object
     pubkey*: ValidatorPubKey
 
@@ -327,7 +327,7 @@ type
     withdrawable_epoch*: Epoch
       ## When validator can withdraw or transfer funds
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#pendingattestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#pendingattestation
   PendingAttestation* = object
     aggregation_bits*: CommitteeValidatorsBits
     data*: AttestationData
@@ -336,12 +336,12 @@ type
 
     proposer_index*: uint64 # `ValidatorIndex` after validation
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#historicalbatch
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#historicalbatch
   HistoricalBatch* = object
     block_roots* : array[SLOTS_PER_HISTORICAL_ROOT, Eth2Digest]
     state_roots* : array[SLOTS_PER_HISTORICAL_ROOT, Eth2Digest]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#fork
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#fork
   Fork* = object
     previous_version*: Version
     current_version*: Version
@@ -349,13 +349,13 @@ type
     epoch*: Epoch
       ## Epoch of latest fork
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#eth1data
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#eth1data
   Eth1Data* = object
     deposit_root*: Eth2Digest
     deposit_count*: uint64
     block_hash*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#signedvoluntaryexit
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#signedvoluntaryexit
   SignedVoluntaryExit* = object
     message*: VoluntaryExit
     signature*: ValidatorSig
@@ -364,7 +364,7 @@ type
     message*: VoluntaryExit
     signature*: TrustedSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#beaconblockheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#beaconblockheader
   BeaconBlockHeader* = object
     slot*: Slot
     proposer_index*: uint64 # `ValidatorIndex` after validation
@@ -372,14 +372,14 @@ type
     state_root*: Eth2Digest
     body_root*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#signingdata
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#signingdata
   SigningData* = object
     object_root*: Eth2Digest
     domain*: Eth2Domain
 
   GraffitiBytes* = distinct array[MAX_GRAFFITI_SIZE, byte]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#signedbeaconblockheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#signedbeaconblockheader
   SignedBeaconBlockHeader* = object
     message*: BeaconBlockHeader
     signature*: ValidatorSig
@@ -388,13 +388,13 @@ type
     message*: BeaconBlockHeader
     signature*: TrustedSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregateandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#aggregateandproof
   AggregateAndProof* = object
     aggregator_index*: uint64 # `ValidatorIndex` after validation
     aggregate*: Attestation
     selection_proof*: ValidatorSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#signedaggregateandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#signedaggregateandproof
   SignedAggregateAndProof* = object
     message*: AggregateAndProof
     signature*: ValidatorSig
@@ -411,12 +411,12 @@ type
     sync_committees*: Table[SyncCommitteePeriod, SyncCommitteeCache]
 
   # This matches the mutable state of the Solidity deposit contract
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/solidity_deposit_contract/deposit_contract.sol
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/solidity_deposit_contract/deposit_contract.sol
   DepositContractState* = object
     branch*: array[DEPOSIT_CONTRACT_TREE_DEPTH, Eth2Digest]
     deposit_count*: array[32, byte] # Uint256
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#validator
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#validator
   ValidatorStatus* = object
     # This is a validator without the expensive, immutable, append-only parts
     # serialized. They're represented in memory to allow in-place SSZ reading
@@ -442,7 +442,7 @@ type
     withdrawable_epoch*: Epoch
       ## When validator can withdraw or transfer funds
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#eth2-field
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#eth2-field
   ENRForkID* = object
     fork_digest*: ForkDigest
     next_fork_version*: Version
diff --git a/beacon_chain/spec/datatypes/constants.nim b/beacon_chain/spec/datatypes/constants.nim
index 23e8060bb..e6b6f26c6 100644
--- a/beacon_chain/spec/datatypes/constants.nim
+++ b/beacon_chain/spec/datatypes/constants.nim
@@ -21,7 +21,7 @@ const
   FAR_FUTURE_EPOCH* = Epoch(not 0'u64)
   FAR_FUTURE_PERIOD* = SyncCommitteePeriod(not 0'u64)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#domain-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#domain-types
   DOMAIN_BEACON_PROPOSER* = DomainType([byte 0x00, 0x00, 0x00, 0x00])
   DOMAIN_BEACON_ATTESTER* = DomainType([byte 0x01, 0x00, 0x00, 0x00])
   DOMAIN_RANDAO* = DomainType([byte 0x02, 0x00, 0x00, 0x00])
@@ -31,7 +31,7 @@ const
   DOMAIN_AGGREGATE_AND_PROOF* = DomainType([byte 0x06, 0x00, 0x00, 0x00])
   DOMAIN_APPLICATION_MASK* = DomainType([byte 0x00, 0x00, 0x00, 0x01])
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#domain-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#domain-types
   DOMAIN_SYNC_COMMITTEE* = DomainType([byte 0x07, 0x00, 0x00, 0x00])
   DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF* = DomainType([byte 0x08, 0x00, 0x00, 0x00])
   DOMAIN_CONTRIBUTION_AND_PROOF* = DomainType([byte 0x09, 0x00, 0x00, 0x00])
@@ -42,8 +42,8 @@ const
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/beacon-chain.md#transition-settings
   TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH* = FAR_FUTURE_EPOCH
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/fork-choice.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/fork-choice.md#configuration
   PROPOSER_SCORE_BOOST*: uint64 = 40
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#misc
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#misc
   ATTESTATION_SUBNET_COUNT*: uint64 = 64
diff --git a/beacon_chain/spec/digest.nim b/beacon_chain/spec/digest.nim
index 964acd7f1..35bc1fe9e 100644
--- a/beacon_chain/spec/digest.nim
+++ b/beacon_chain/spec/digest.nim
@@ -7,7 +7,7 @@
 
 # Serenity hash function / digest
 #
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#hash
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#hash
 #
 # In Phase 0 the beacon chain is deployed with SHA256 (SHA2-256).
 # Note that is is different from Keccak256 (often mistakenly called SHA3-256)
diff --git a/beacon_chain/spec/eth2_apis/rest_types.nim b/beacon_chain/spec/eth2_apis/rest_types.nim
index f888d6f03..43d3a6829 100644
--- a/beacon_chain/spec/eth2_apis/rest_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_types.nim
@@ -268,7 +268,7 @@ type
     of BeaconBlockFork.Capella:   cappellaBody*: capella.BeaconBlockBody
 
   RestSpec* = object
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/phase0.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/phase0.yaml
     MAX_COMMITTEES_PER_SLOT*: uint64
     TARGET_COMMITTEE_SIZE*: uint64
     MAX_VALIDATORS_PER_COMMITTEE*: uint64
@@ -303,7 +303,7 @@ type
     MAX_DEPOSITS*: uint64
     MAX_VOLUNTARY_EXITS*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/altair.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/altair.yaml
     INACTIVITY_PENALTY_QUOTIENT_ALTAIR*: uint64
     MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR*: uint64
     PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR*: uint64
@@ -312,7 +312,7 @@ type
     MIN_SYNC_COMMITTEE_PARTICIPANTS*: uint64
     UPDATE_TIMEOUT*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/bellatrix.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/bellatrix.yaml
     INACTIVITY_PENALTY_QUOTIENT_BELLATRIX*: uint64
     MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX*: uint64
     PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX*: uint64
@@ -354,7 +354,7 @@ type
     DEPOSIT_NETWORK_ID*: uint64
     DEPOSIT_CONTRACT_ADDRESS*: Eth1Address
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#constants
     # GENESIS_SLOT
     # GENESIS_EPOCH
     # FAR_FUTURE_EPOCH
@@ -372,7 +372,7 @@ type
     DOMAIN_SELECTION_PROOF*: DomainType
     DOMAIN_AGGREGATE_AND_PROOF*: DomainType
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#constants
     TIMELY_SOURCE_FLAG_INDEX*: byte
     TIMELY_TARGET_FLAG_INDEX*: byte
     TIMELY_HEAD_FLAG_INDEX*: byte
@@ -387,7 +387,7 @@ type
     DOMAIN_CONTRIBUTION_AND_PROOF*: DomainType
     # PARTICIPATION_FLAG_WEIGHTS
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#constants
     TARGET_AGGREGATORS_PER_COMMITTEE*: uint64
     RANDOM_SUBNETS_PER_VALIDATOR*: uint64
     EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION*: uint64
diff --git a/beacon_chain/spec/forks.nim b/beacon_chain/spec/forks.nim
index 3ea4a7d8a..779e6da91 100644
--- a/beacon_chain/spec/forks.nim
+++ b/beacon_chain/spec/forks.nim
@@ -758,7 +758,7 @@ func toBeaconBlockFork*(fork: BeaconStateFork): BeaconBlockFork =
   of BeaconStateFork.Bellatrix: BeaconBlockFork.Bellatrix
   of BeaconStateFork.Capella:   BeaconBlockFork.Capella
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_fork_data_root
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_fork_data_root
 func compute_fork_data_root*(current_version: Version,
     genesis_validators_root: Eth2Digest): Eth2Digest =
   ## Return the 32-byte fork data root for the ``current_version`` and
@@ -770,7 +770,7 @@ func compute_fork_data_root*(current_version: Version,
     genesis_validators_root: genesis_validators_root
   ))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_fork_digest
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_fork_digest
 func compute_fork_digest*(current_version: Version,
                           genesis_validators_root: Eth2Digest): ForkDigest =
   ## Return the 4-byte fork digest for the ``current_version`` and
diff --git a/beacon_chain/spec/keystore.nim b/beacon_chain/spec/keystore.nim
index fd3054ac9..890285231 100644
--- a/beacon_chain/spec/keystore.nim
+++ b/beacon_chain/spec/keystore.nim
@@ -1001,7 +1001,7 @@ proc createWallet*(kdfKind: KdfKind,
     crypto: crypto,
     nextAccount: nextAccount.get(0))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#bls_withdrawal_prefix
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#bls_withdrawal_prefix
 func makeWithdrawalCredentials*(k: ValidatorPubKey): Eth2Digest =
   var bytes = eth2digest(k.toRaw())
   bytes.data[0] = BLS_WITHDRAWAL_PREFIX.uint8
diff --git a/beacon_chain/spec/light_client_sync.nim b/beacon_chain/spec/light_client_sync.nim
index d35f704ee..e960a5b04 100644
--- a/beacon_chain/spec/light_client_sync.nim
+++ b/beacon_chain/spec/light_client_sync.nim
@@ -18,7 +18,7 @@ import
 from ../consensus_object_pools/block_pools_types import BlockError
 export block_pools_types.BlockError
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#initialize_light_client_store
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#initialize_light_client_store
 func initialize_light_client_store*(
     trusted_block_root: Eth2Digest,
     bootstrap: altair.LightClientBootstrap
@@ -39,7 +39,7 @@ func initialize_light_client_store*(
     current_sync_committee: bootstrap.current_sync_committee,
     optimistic_header: bootstrap.header))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#validate_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#validate_light_client_update
 proc validate_light_client_update*(
     store: LightClientStore,
     update: SomeLightClientUpdate,
@@ -148,7 +148,7 @@ proc validate_light_client_update*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#apply_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#apply_light_client_update
 func apply_light_client_update(
     store: var LightClientStore,
     update: SomeLightClientUpdate): bool =
@@ -179,7 +179,7 @@ func apply_light_client_update(
     didProgress = true
   didProgress
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#process_light_client_store_force_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/sync-protocol.md#process_light_client_store_force_update
 type
   ForceUpdateResult* = enum
     NoUpdate,
diff --git a/beacon_chain/spec/network.nim b/beacon_chain/spec/network.nim
index 574afda4b..5a82cd477 100644
--- a/beacon_chain/spec/network.nim
+++ b/beacon_chain/spec/network.nim
@@ -17,7 +17,7 @@ import
 export base
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#topics-and-messages
   topicBeaconBlocksSuffix* = "beacon_block/ssz_snappy"
   topicVoluntaryExitsSuffix* = "voluntary_exit/ssz_snappy"
   topicProposerSlashingsSuffix* = "proposer_slashing/ssz_snappy"
@@ -30,7 +30,7 @@ const
   TTFB_TIMEOUT* = 5.seconds
   RESP_TIMEOUT* = 10.seconds
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/bellatrix/p2p-interface.md#configuration
   GOSSIP_MAX_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
   MAX_CHUNK_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
 
@@ -63,7 +63,7 @@ func getAttesterSlashingsTopic*(forkDigest: ForkDigest): string =
 func getAggregateAndProofsTopic*(forkDigest: ForkDigest): string =
   eth2Prefix(forkDigest) & topicAggregateAndProofsSuffix
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#broadcast-attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#broadcast-attestation
 func compute_subnet_for_attestation*(
     committees_per_slot: uint64, slot: Slot, committee_index: CommitteeIndex):
     SubnetId =
@@ -79,29 +79,29 @@ func compute_subnet_for_attestation*(
     (committees_since_epoch_start + committee_index.asUInt64) mod
     ATTESTATION_SUBNET_COUNT)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#broadcast-attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#broadcast-attestation
 func getAttestationTopic*(forkDigest: ForkDigest,
                           subnetId: SubnetId): string =
   ## For subscribing and unsubscribing to/from a subnet.
   eth2Prefix(forkDigest) & "beacon_attestation_" & $(subnetId) & "/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/p2p-interface.md#topics-and-messages
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#topics-and-messages
 func getSyncCommitteeTopic*(forkDigest: ForkDigest,
                             subcommitteeIdx: SyncSubcommitteeIndex): string =
   ## For subscribing and unsubscribing to/from a subnet.
   eth2Prefix(forkDigest) & "sync_committee_" & $subcommitteeIdx & "/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/p2p-interface.md#topics-and-messages
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#topics-and-messages
 func getSyncCommitteeContributionAndProofTopic*(forkDigest: ForkDigest): string =
   ## For subscribing and unsubscribing to/from a subnet.
   eth2Prefix(forkDigest) & "sync_committee_contribution_and_proof/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
 func getLightClientFinalityUpdateTopic*(forkDigest: ForkDigest): string =
   ## For broadcasting or obtaining the latest `LightClientFinalityUpdate`.
   eth2Prefix(forkDigest) & "light_client_finality_update/ssz_snappy"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
 func getLightClientOptimisticUpdateTopic*(forkDigest: ForkDigest): string =
   ## For broadcasting or obtaining the latest `LightClientOptimisticUpdate`.
   eth2Prefix(forkDigest) & "light_client_optimistic_update/ssz_snappy"
@@ -138,7 +138,7 @@ func getDiscoveryForkID*(cfg: RuntimeConfig,
       next_fork_version: current_fork_version,
       next_fork_epoch: FAR_FUTURE_EPOCH)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/p2p-interface.md#transitioning-the-gossip
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#transitioning-the-gossip
 type GossipState* = set[BeaconStateFork]
 func getTargetGossipState*(
     epoch, ALTAIR_FORK_EPOCH, BELLATRIX_FORK_EPOCH: Epoch, isBehind: bool):
diff --git a/beacon_chain/spec/presets.nim b/beacon_chain/spec/presets.nim
index 0053dbf46..a26e7761e 100644
--- a/beacon_chain/spec/presets.nim
+++ b/beacon_chain/spec/presets.nim
@@ -20,7 +20,7 @@ export constants
 export stint, ethtypes.toHex, ethtypes.`==`
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#withdrawal-prefixes
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#withdrawal-prefixes
   BLS_WITHDRAWAL_PREFIX*: byte = 0
   ETH1_ADDRESS_WITHDRAWAL_PREFIX*: byte = 1
 
@@ -510,7 +510,7 @@ template name*(cfg: RuntimeConfig): string =
   else:
     const_preset
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#configuration
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#configuration
 func MIN_EPOCHS_FOR_BLOCK_REQUESTS*(cfg: RuntimeConfig): uint64 =
   cfg.MIN_VALIDATOR_WITHDRAWABILITY_DELAY + cfg.CHURN_LIMIT_QUOTIENT div 2
 
diff --git a/beacon_chain/spec/presets/mainnet/altair_preset.nim b/beacon_chain/spec/presets/mainnet/altair_preset.nim
index 4f4571162..4be3432a9 100644
--- a/beacon_chain/spec/presets/mainnet/altair_preset.nim
+++ b/beacon_chain/spec/presets/mainnet/altair_preset.nim
@@ -1,5 +1,5 @@
 # Mainnet preset - Altair
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/altair.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/altair.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim b/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim
index ceb862f01..44c3847a6 100644
--- a/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim
+++ b/beacon_chain/spec/presets/mainnet/bellatrix_preset.nim
@@ -1,5 +1,5 @@
 # Mainnet preset - Bellatrix
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/bellatrix.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/bellatrix.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/mainnet/phase0_preset.nim b/beacon_chain/spec/presets/mainnet/phase0_preset.nim
index f8effcd82..077865172 100644
--- a/beacon_chain/spec/presets/mainnet/phase0_preset.nim
+++ b/beacon_chain/spec/presets/mainnet/phase0_preset.nim
@@ -1,5 +1,5 @@
 # Mainnet preset - Phase0
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/mainnet/phase0.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/mainnet/phase0.yaml
 
 const
   #
diff --git a/beacon_chain/spec/presets/minimal/altair_preset.nim b/beacon_chain/spec/presets/minimal/altair_preset.nim
index a70eb4e48..464242e09 100644
--- a/beacon_chain/spec/presets/minimal/altair_preset.nim
+++ b/beacon_chain/spec/presets/minimal/altair_preset.nim
@@ -1,5 +1,5 @@
 # Minimal preset - Altair
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/minimal/altair.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/minimal/altair.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/minimal/bellatrix_preset.nim b/beacon_chain/spec/presets/minimal/bellatrix_preset.nim
index 55c50e0ef..6de4814c6 100644
--- a/beacon_chain/spec/presets/minimal/bellatrix_preset.nim
+++ b/beacon_chain/spec/presets/minimal/bellatrix_preset.nim
@@ -1,5 +1,5 @@
 # Minimal preset - Bellatrix
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/minimal/bellatrix.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/minimal/bellatrix.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/presets/minimal/phase0_preset.nim b/beacon_chain/spec/presets/minimal/phase0_preset.nim
index 5e79533b6..d2f8beb55 100644
--- a/beacon_chain/spec/presets/minimal/phase0_preset.nim
+++ b/beacon_chain/spec/presets/minimal/phase0_preset.nim
@@ -1,5 +1,5 @@
 # Minimal preset - Phase0
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/presets/minimal/phase0.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/presets/minimal/phase0.yaml
 
 const
   #
diff --git a/beacon_chain/spec/signatures.nim b/beacon_chain/spec/signatures.nim
index e94859c09..1ed0b8e30 100644
--- a/beacon_chain/spec/signatures.nim
+++ b/beacon_chain/spec/signatures.nim
@@ -48,7 +48,7 @@ func compute_slot_signing_root*(
       fork, DOMAIN_SELECTION_PROOF, epoch, genesis_validators_root)
   compute_signing_root(slot, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#aggregation-selection
 func get_slot_signature*(
     fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
     privkey: ValidatorPrivKey): CookedSig =
@@ -72,7 +72,7 @@ func compute_epoch_signing_root*(
   let domain = get_domain(fork, DOMAIN_RANDAO, epoch, genesis_validators_root)
   compute_signing_root(epoch, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#randao-reveal
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#randao-reveal
 func get_epoch_signature*(
     fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
     privkey: ValidatorPrivKey): CookedSig =
@@ -101,7 +101,7 @@ func compute_block_signing_root*(
       fork, DOMAIN_BEACON_PROPOSER, epoch, genesis_validators_root)
   compute_signing_root(blck, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#signature
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#signature
 func get_block_signature*(
     fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
     root: Eth2Digest, privkey: ValidatorPrivKey): CookedSig =
@@ -130,7 +130,7 @@ func compute_aggregate_and_proof_signing_root*(
       fork, DOMAIN_AGGREGATE_AND_PROOF, epoch, genesis_validators_root)
   compute_signing_root(aggregate_and_proof, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#broadcast-aggregate
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#broadcast-aggregate
 func get_aggregate_and_proof_signature*(fork: Fork, genesis_validators_root: Eth2Digest,
                                         aggregate_and_proof: AggregateAndProof,
                                         privkey: ValidatorPrivKey): CookedSig =
@@ -158,7 +158,7 @@ func compute_attestation_signing_root*(
       fork, DOMAIN_BEACON_ATTESTER, epoch, genesis_validators_root)
   compute_signing_root(attestation_data, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregate-signature
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#aggregate-signature
 func get_attestation_signature*(
     fork: Fork, genesis_validators_root: Eth2Digest,
     attestation_data: AttestationData,
@@ -186,7 +186,7 @@ func compute_deposit_signing_root*(
     domain = compute_domain(DOMAIN_DEPOSIT, version)
   compute_signing_root(deposit_message, domain)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#deposits
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#deposits
 func get_deposit_signature*(preset: RuntimeConfig,
                             deposit: DepositData,
                             privkey: ValidatorPrivKey): CookedSig =
diff --git a/beacon_chain/spec/signatures_batch.nim b/beacon_chain/spec/signatures_batch.nim
index 651665f31..9a989f87f 100644
--- a/beacon_chain/spec/signatures_batch.nim
+++ b/beacon_chain/spec/signatures_batch.nim
@@ -77,7 +77,7 @@ proc aggregateAttesters(
     # Aggregation spec requires non-empty collection
     # - https://tools.ietf.org/html/draft-irtf-cfrg-bls-signature-04
     # Eth2 spec requires at least one attesting index in attestation
-    # - https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+    # - https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
     return err("aggregateAttesters: no attesting indices")
 
   let
@@ -106,7 +106,7 @@ proc aggregateAttesters(
     # Aggregation spec requires non-empty collection
     # - https://tools.ietf.org/html/draft-irtf-cfrg-bls-signature-04
     # Eth2 spec requires at least one attesting index in attestation
-    # - https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+    # - https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
     return err("aggregateAttesters: no attesting indices")
 
   var attestersAgg{.noinit.}: AggregatePublicKey
diff --git a/beacon_chain/spec/state_transition.nim b/beacon_chain/spec/state_transition.nim
index d53dd21f1..e80f0c90f 100644
--- a/beacon_chain/spec/state_transition.nim
+++ b/beacon_chain/spec/state_transition.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # State transition, as described in
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 #
 # The entry point is `state_transition` which is at the bottom of the file!
 #
@@ -54,7 +54,7 @@ import
 
 export results, extras, phase0, altair, bellatrix
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 proc verify_block_signature(
     state: ForkyBeaconState, signed_block: SomeForkySignedBeaconBlock):
     Result[void, cstring] =
@@ -71,7 +71,7 @@ proc verify_block_signature(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 func verifyStateRoot(
     state: ForkyBeaconState, blck: ForkyBeaconBlock | ForkySigVerifiedBeaconBlock):
     Result[void, cstring] =
@@ -100,7 +100,7 @@ func noRollback*() =
 # Hashed-state transition functions
 # ---------------------------------------------------------------
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 func process_slot*(
     state: var ForkyBeaconState, pre_state_root: Eth2Digest) =
   # `process_slot` is the first stage of per-slot processing - it is run for
@@ -125,7 +125,7 @@ func clear_epoch_from_cache(cache: var StateCache, epoch: Epoch) =
   for slot in epoch.slots():
     cache.beacon_proposer_indices.del slot
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 proc advance_slot(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState, previous_slot_state_root: Eth2Digest,
@@ -295,7 +295,7 @@ proc state_transition*(
   state_transition_block(
     cfg, state, signedBlock, cache, flags, rollback)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#preparing-for-a-beaconblock
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#preparing-for-a-beaconblock
 template partialBeaconBlock(
     cfg: RuntimeConfig,
     state: var phase0.HashedBeaconState,
diff --git a/beacon_chain/spec/state_transition_block.nim b/beacon_chain/spec/state_transition_block.nim
index f49c71fe5..ea8dc4051 100644
--- a/beacon_chain/spec/state_transition_block.nim
+++ b/beacon_chain/spec/state_transition_block.nim
@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # State transition - block processing, as described in
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#block-processing
 #
 # The entry point is `process_block` which is at the bottom of this file.
 #
@@ -34,7 +34,7 @@ from ./datatypes/capella import
 
 export extras, phase0, altair
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#block-header
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#block-header
 func process_block_header*(
     state: var ForkyBeaconState, blck: SomeForkyBeaconBlock, flags: UpdateFlags,
     cache: var StateCache): Result[void, cstring] =
@@ -77,7 +77,7 @@ func `xor`[T: array](a, b: T): T =
   for i in 0..<result.len:
     result[i] = a[i] xor b[i]
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#randao
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#randao
 proc process_randao(
     state: var ForkyBeaconState, body: SomeForkyBeaconBlockBody, flags: UpdateFlags,
     cache: var StateCache): Result[void, cstring] =
@@ -118,7 +118,7 @@ proc process_randao(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#eth1-data
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#eth1-data
 func process_eth1_data(state: var ForkyBeaconState, body: SomeForkyBeaconBlockBody): Result[void, cstring]=
   if not state.eth1_data_votes.add body.eth1_data:
     # Count is reset  in process_final_updates, so this should never happen
@@ -129,14 +129,14 @@ func process_eth1_data(state: var ForkyBeaconState, body: SomeForkyBeaconBlockBo
     state.eth1_data = body.eth1_data
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#is_slashable_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#is_slashable_validator
 func is_slashable_validator(validator: Validator, epoch: Epoch): bool =
   # Check if ``validator`` is slashable.
   (not validator.slashed) and
     (validator.activation_epoch <= epoch) and
     (epoch < validator.withdrawable_epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#proposer-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#proposer-slashings
 proc check_proposer_slashing*(
     state: ForkyBeaconState, proposer_slashing: SomeProposerSlashing,
     flags: UpdateFlags):
@@ -185,7 +185,7 @@ proc check_proposer_slashing*(
   withState(state):
     check_proposer_slashing(forkyState.data, proposer_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#proposer-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#proposer-slashings
 proc process_proposer_slashing*(
     cfg: RuntimeConfig, state: var ForkyBeaconState,
     proposer_slashing: SomeProposerSlashing, flags: UpdateFlags,
@@ -195,7 +195,7 @@ proc process_proposer_slashing*(
   ? slash_validator(cfg, state, proposer_index, cache)
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#is_slashable_attestation_data
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#is_slashable_attestation_data
 func is_slashable_attestation_data(
     data_1: AttestationData, data_2: AttestationData): bool =
   ## Check if ``data_1`` and ``data_2`` are slashable according to Casper FFG
@@ -207,7 +207,7 @@ func is_slashable_attestation_data(
     (data_1.source.epoch < data_2.source.epoch and
      data_2.target.epoch < data_1.target.epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#attester-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#attester-slashings
 proc check_attester_slashing*(
        state: ForkyBeaconState,
        attester_slashing: SomeAttesterSlashing,
@@ -249,7 +249,7 @@ proc check_attester_slashing*(
   withState(state):
     check_attester_slashing(forkyState.data, attester_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#attester-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#attester-slashings
 proc process_attester_slashing*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -332,7 +332,7 @@ proc process_deposit*(cfg: RuntimeConfig,
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#voluntary-exits
 proc check_voluntary_exit*(
     cfg: RuntimeConfig,
     state: ForkyBeaconState,
@@ -381,7 +381,7 @@ proc check_voluntary_exit*(
   withState(state):
     check_voluntary_exit(cfg, forkyState.data, signed_voluntary_exit, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#voluntary-exits
 proc process_voluntary_exit*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -463,7 +463,7 @@ proc process_operations(cfg: RuntimeConfig,
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#sync-committee-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#sync-committee-processing
 func get_participant_reward*(total_active_balance: Gwei): Gwei =
   let
     total_active_increments =
@@ -478,7 +478,7 @@ func get_participant_reward*(total_active_balance: Gwei): Gwei =
 func get_proposer_reward*(participant_reward: Gwei): Gwei =
   participant_reward * PROPOSER_WEIGHT div (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#sync-committee-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#sync-committee-processing
 proc process_sync_aggregate*(
     state: var (altair.BeaconState | bellatrix.BeaconState | capella.BeaconState),
     sync_aggregate: SomeSyncAggregate, total_active_balance: Gwei,
@@ -642,7 +642,7 @@ func process_withdrawals*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#block-processing
 # TODO workaround for https://github.com/nim-lang/Nim/issues/18095
 # copy of datatypes/phase0.nim
 type SomePhase0Block =
@@ -662,7 +662,7 @@ proc process_block*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#block-processing
 # TODO workaround for https://github.com/nim-lang/Nim/issues/18095
 # copy of datatypes/altair.nim
 type SomeAltairBlock =
diff --git a/beacon_chain/spec/state_transition_epoch.nim b/beacon_chain/spec/state_transition_epoch.nim
index 1162c0840..c0e1112f5 100644
--- a/beacon_chain/spec/state_transition_epoch.nim
+++ b/beacon_chain/spec/state_transition_epoch.nim
@@ -6,8 +6,8 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 # State transition - epoch processing, as described in
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#epoch-processing and
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#epoch-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#epoch-processing and
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#epoch-processing
 #
 # The entry point is `process_epoch`, which is at the bottom of this file.
 #
@@ -40,7 +40,7 @@ export extras, phase0, altair
 logScope: topics = "consens"
 
 # Accessors that implement the max condition in `get_total_balance`:
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_total_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_total_balance
 template current_epoch*(v: TotalBalances): Gwei =
   max(EFFECTIVE_BALANCE_INCREMENT, v.current_epoch_raw)
 template previous_epoch*(v: TotalBalances): Gwei =
@@ -155,7 +155,7 @@ func process_attestations*(
     if v.flags.contains RewardFlags.isPreviousEpochHeadAttester:
       info.balances.previous_epoch_head_attesters_raw += validator_balance
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#helpers
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#helpers
 # get_eligible_validator_indices
 func is_eligible_validator*(validator: RewardStatus): bool =
   validator.flags.contains(RewardFlags.isActiveInPreviousEpoch) or
@@ -172,8 +172,8 @@ func is_eligible_validator*(validator: ParticipationInfo): bool =
 # Spec
 # --------------------------------------------------------
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#get_unslashed_participating_indices
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_total_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#get_unslashed_participating_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_total_balance
 func get_unslashed_participating_balances*(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState
 ): UnslashedParticipatingBalances =
@@ -240,7 +240,7 @@ func is_unslashed_participating_index(
     has_flag(epoch_participation[].item(validator_index), flag_index) and
     not state.validators[validator_index].slashed
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#justification-and-finalization
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#justification-and-finalization
 type FinalityState = object
   slot: Slot
   current_epoch_ancestor_root: Eth2Digest
@@ -308,7 +308,7 @@ proc weigh_justification_and_finalization(
   ## state.justification_bits[1:] = state.justification_bits[:-1]
   ## state.justification_bits[0] = 0b0
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#misc
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#misc
   const JUSTIFICATION_BITS_LENGTH = 4
 
   state.justification_bits = JustificationBits(
@@ -384,7 +384,7 @@ proc weigh_justification_and_finalization(
       current_epoch = current_epoch,
       checkpoint = shortLog(state.finalized_checkpoint)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#justification-and-finalization
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#justification-and-finalization
 proc process_justification_and_finalization*(
     state: var phase0.BeaconState,
     balances: TotalBalances, flags: UpdateFlags = {}) =
@@ -420,7 +420,7 @@ proc compute_unrealized_finality*(
     justified: finalityState.current_justified_checkpoint,
     finalized: finalityState.finalized_checkpoint)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#justification-and-finalization
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#justification-and-finalization
 proc process_justification_and_finalization*(
     state: var (altair.BeaconState | bellatrix.BeaconState | capella.BeaconState),
     balances: UnslashedParticipatingBalances,
@@ -454,7 +454,7 @@ proc compute_unrealized_finality*(
     justified: finalityState.current_justified_checkpoint,
     finalized: finalityState.finalized_checkpoint)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#helpers
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#helpers
 func get_base_reward_sqrt*(state: phase0.BeaconState, index: ValidatorIndex,
     total_balance_sqrt: auto): Gwei =
   # Spec function recalculates total_balance every time, which creates an
@@ -502,7 +502,7 @@ func get_attestation_component_delta(is_unslashed_attester: bool,
   else:
     RewardDelta(penalties: base_reward)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#components-of-attestation-deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#components-of-attestation-deltas
 func get_source_delta*(validator: RewardStatus,
                        base_reward: uint64,
                        balances: TotalBalances,
@@ -580,7 +580,7 @@ func get_inactivity_penalty_delta*(validator: RewardStatus,
 
   delta
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_attestation_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_attestation_deltas
 func get_attestation_deltas(state: phase0.BeaconState, info: var phase0.EpochInfo) =
   ## Update rewards with attestation reward/penalty deltas for each validator.
 
@@ -624,7 +624,7 @@ func get_attestation_deltas(state: phase0.BeaconState, info: var phase0.EpochInf
         info.validators[proposer_index].delta.add(
           proposer_delta.get()[1])
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#get_base_reward
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#get_base_reward
 func get_base_reward_increment*(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState,
     index: ValidatorIndex, base_reward_per_increment: Gwei): Gwei =
@@ -634,7 +634,7 @@ func get_base_reward_increment*(
     state.validators[index].effective_balance div EFFECTIVE_BALANCE_INCREMENT
   increments * base_reward_per_increment
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#get_flag_index_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#get_flag_index_deltas
 func get_flag_index_reward*(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState,
     base_reward: Gwei, active_increments: Gwei,
@@ -647,16 +647,16 @@ func get_flag_index_reward*(
   else:
     0.Gwei
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#get_flag_index_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#get_flag_index_deltas
 func get_unslashed_participating_increment*(
     info: altair.EpochInfo | bellatrix.BeaconState, flag_index: int): Gwei =
   info.balances.previous_epoch[flag_index] div EFFECTIVE_BALANCE_INCREMENT
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#get_flag_index_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#get_flag_index_deltas
 func get_active_increments*(info: altair.EpochInfo | bellatrix.BeaconState): Gwei =
   info.balances.current_epoch div EFFECTIVE_BALANCE_INCREMENT
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#get_flag_index_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#get_flag_index_deltas
 iterator get_flag_index_deltas*(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState,
     flag_index: int, base_reward_per_increment: Gwei,
@@ -700,7 +700,7 @@ iterator get_flag_index_deltas*(
       else:
         (vidx, RewardDelta(rewards: 0.Gwei, penalties: 0.Gwei))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#modified-get_inactivity_penalty_deltas
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#modified-get_inactivity_penalty_deltas
 iterator get_inactivity_penalty_deltas*(
     cfg: RuntimeConfig, state: altair.BeaconState, info: altair.EpochInfo):
     (ValidatorIndex, Gwei) =
@@ -745,7 +745,7 @@ iterator get_inactivity_penalty_deltas*(
           state.inactivity_scores[vidx]
       yield (vidx, Gwei(penalty_numerator div penalty_denominator))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#rewards-and-penalties-1
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#rewards-and-penalties-1
 func process_rewards_and_penalties*(
     state: var phase0.BeaconState, info: var phase0.EpochInfo) =
   # No rewards are applied at the end of `GENESIS_EPOCH` because rewards are
@@ -768,7 +768,7 @@ func process_rewards_and_penalties*(
     decrease_balance(balance, v.delta.penalties)
     state.balances.asSeq()[idx] = balance
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#rewards-and-penalties
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#rewards-and-penalties
 func process_rewards_and_penalties*(
     cfg: RuntimeConfig, state: var (altair.BeaconState | bellatrix.BeaconState | capella.BeaconState),
     info: var altair.EpochInfo)
@@ -803,7 +803,7 @@ func process_rewards_and_penalties*(
     decrease_balance(balance, info.validators[vidx].delta.penalties)
     state.balances.asSeq()[vidx] = balance
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#registry-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#registry-updates
 func process_registry_updates*(
     cfg: RuntimeConfig, state: var ForkyBeaconState, cache: var StateCache):
     Result[void, cstring] =
@@ -856,8 +856,8 @@ func process_registry_updates*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#slashings
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#slashings
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/beacon-chain.md#slashings
 func get_adjusted_total_slashing_balance*(
     state: ForkyBeaconState, total_balance: Gwei): Gwei =
@@ -876,15 +876,15 @@ func get_adjusted_total_slashing_balance*(
       {.fatal: "process_slashings: incorrect BeaconState type".}
   min(sum(state.slashings.data) * multiplier, total_balance)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#slashings
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#slashings
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/beacon-chain.md#slashings
 func slashing_penalty_applies*(validator: Validator, epoch: Epoch): bool =
   validator.slashed and
   epoch + EPOCHS_PER_SLASHINGS_VECTOR div 2 == validator.withdrawable_epoch
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#slashings
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#slashings
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/beacon-chain.md#slashings
 func get_slashing_penalty*(validator: Validator,
                           adjusted_total_slashing_balance,
@@ -895,8 +895,8 @@ func get_slashing_penalty*(validator: Validator,
                           adjusted_total_slashing_balance
   penalty_numerator div total_balance * increment
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#slashings
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#slashings
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/bellatrix/beacon-chain.md#slashings
 func process_slashings*(state: var ForkyBeaconState, total_balance: Gwei) =
   let
@@ -911,7 +911,7 @@ func process_slashings*(state: var ForkyBeaconState, total_balance: Gwei) =
         validator[], adjusted_total_slashing_balance, total_balance)
       decrease_balance(state, vidx, penalty)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#eth1-data-votes-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#eth1-data-votes-updates
 func process_eth1_data_reset*(state: var ForkyBeaconState) =
   let next_epoch = get_current_epoch(state) + 1
 
@@ -919,7 +919,7 @@ func process_eth1_data_reset*(state: var ForkyBeaconState) =
   if next_epoch mod EPOCHS_PER_ETH1_VOTING_PERIOD == 0:
     state.eth1_data_votes = default(type state.eth1_data_votes)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#effective-balances-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#effective-balances-updates
 func process_effective_balance_updates*(state: var ForkyBeaconState) =
   # Update effective balances with hysteresis
   for vidx in state.validators.vindices:
@@ -941,14 +941,14 @@ func process_effective_balance_updates*(state: var ForkyBeaconState) =
       if new_effective_balance != effective_balance:
         state.validators.mitem(vidx).effective_balance = new_effective_balance
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#slashings-balances-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#slashings-balances-updates
 func process_slashings_reset*(state: var ForkyBeaconState) =
   let next_epoch = get_current_epoch(state) + 1
 
   # Reset slashings
   state.slashings[int(next_epoch mod EPOCHS_PER_SLASHINGS_VECTOR)] = 0.Gwei
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#randao-mixes-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#randao-mixes-updates
 func process_randao_mixes_reset*(state: var ForkyBeaconState) =
   let
     current_epoch = get_current_epoch(state)
@@ -961,12 +961,12 @@ func process_randao_mixes_reset*(state: var ForkyBeaconState) =
 func compute_historical_root*(state: var ForkyBeaconState): Eth2Digest =
   # Equivalent to hash_tree_root(foo: HistoricalBatch), but without using
   # significant additional stack or heap.
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#historicalbatch
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#historicalbatch
   # In response to https://github.com/status-im/nimbus-eth2/issues/921
   hash_tree_root([
     hash_tree_root(state.block_roots), hash_tree_root(state.state_roots)])
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#historical-roots-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#historical-roots-updates
 func process_historical_roots_update*(state: var ForkyBeaconState) =
   ## Set historical root accumulator
   let next_epoch = get_current_epoch(state) + 1
@@ -974,19 +974,19 @@ func process_historical_roots_update*(state: var ForkyBeaconState) =
   if next_epoch mod (SLOTS_PER_HISTORICAL_ROOT div SLOTS_PER_EPOCH) == 0:
     # Equivalent to hash_tree_root(foo: HistoricalBatch), but without using
     # significant additional stack or heap.
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#historicalbatch
+    # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#historicalbatch
     # In response to https://github.com/status-im/nimbus-eth2/issues/921
     if not state.historical_roots.add state.compute_historical_root():
       raiseAssert "no more room for historical roots, so long and thanks for the fish!"
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#participation-records-rotation
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#participation-records-rotation
 func process_participation_record_updates*(state: var phase0.BeaconState) =
   # Rotate current/previous epoch attestations - using swap avoids copying all
   # elements using a slow genericSeqAssign
   state.previous_epoch_attestations.clear()
   swap(state.previous_epoch_attestations, state.current_epoch_attestations)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#participation-flags-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#participation-flags-updates
 func process_participation_flag_updates*(
     state: var (altair.BeaconState | bellatrix.BeaconState | capella.BeaconState)) =
   state.previous_epoch_participation = state.current_epoch_participation
@@ -1001,7 +1001,7 @@ func process_participation_flag_updates*(
 
   state.current_epoch_participation.asHashList.resetCache()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#sync-committee-updates
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#sync-committee-updates
 func process_sync_committee_updates*(
     state: var (altair.BeaconState | bellatrix.BeaconState | capella.BeaconState)) =
   let next_epoch = get_current_epoch(state) + 1
@@ -1009,7 +1009,7 @@ func process_sync_committee_updates*(
     state.current_sync_committee = state.next_sync_committee
     state.next_sync_committee = get_next_sync_committee(state)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#inactivity-scores
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#inactivity-scores
 func process_inactivity_updates*(
     cfg: RuntimeConfig,
     state: var (altair.BeaconState | bellatrix.BeaconState | capella.BeaconState),
@@ -1122,7 +1122,7 @@ func process_partial_withdrawals*(state: var capella.BeaconState) =
 
   state.next_partial_withdrawal_validator_index = validator_index
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#epoch-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#epoch-processing
 proc process_epoch*(
     cfg: RuntimeConfig, state: var phase0.BeaconState, flags: UpdateFlags,
     cache: var StateCache, info: var phase0.EpochInfo): Result[void, cstring] =
@@ -1179,7 +1179,7 @@ func init*(
     state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState): T =
   init(result, state)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/beacon-chain.md#epoch-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/beacon-chain.md#epoch-processing
 proc process_epoch*(
     cfg: RuntimeConfig, state: var (altair.BeaconState | bellatrix.BeaconState),
     flags: UpdateFlags, cache: var StateCache, info: var altair.EpochInfo):
@@ -1190,7 +1190,7 @@ proc process_epoch*(
 
   info.init(state)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#justification-and-finalization
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#justification-and-finalization
   process_justification_and_finalization(state, info.balances, flags)
 
   # state.slot hasn't been incremented yet.
@@ -1205,13 +1205,13 @@ proc process_epoch*(
 
   process_inactivity_updates(cfg, state, info)  # [New in Altair]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#process_rewards_and_penalties
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#process_rewards_and_penalties
   process_rewards_and_penalties(cfg, state, info)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#registry-updates
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#registry-updates
   ? process_registry_updates(cfg, state, cache)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#slashings
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#slashings
   process_slashings(state, info.balances.current_epoch)
 
   process_eth1_data_reset(state)
@@ -1235,7 +1235,7 @@ proc process_epoch*(
 
   info.init(state)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#justification-and-finalization
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#justification-and-finalization
   process_justification_and_finalization(state, info.balances, flags)
 
   # state.slot hasn't been incremented yet.
@@ -1250,13 +1250,13 @@ proc process_epoch*(
 
   process_inactivity_updates(cfg, state, info)  # [New in Altair]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#process_rewards_and_penalties
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#process_rewards_and_penalties
   process_rewards_and_penalties(cfg, state, info)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#registry-updates
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#registry-updates
   ? process_registry_updates(cfg, state, cache)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#slashings
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#slashings
   process_slashings(state, info.balances.current_epoch)
 
   process_eth1_data_reset(state)
diff --git a/beacon_chain/spec/validator.nim b/beacon_chain/spec/validator.nim
index f8f9a5534..d9b4acdda 100644
--- a/beacon_chain/spec/validator.nim
+++ b/beacon_chain/spec/validator.nim
@@ -25,8 +25,8 @@ const
   PIVOT_VIEW_SIZE = SEED_SIZE + ROUND_SIZE
   TOTAL_SIZE = PIVOT_VIEW_SIZE + POSITION_WINDOW_SIZE
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_shuffled_index
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_shuffled_index
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_committee
 # Port of https://github.com/protolambda/zrnt/blob/master/eth2/beacon/shuffle.go
 # Shuffles or unshuffles, depending on the `dir` (true for shuffling, false for unshuffling
 func shuffle_list*(input: var seq[ValidatorIndex], seed: Eth2Digest) =
@@ -156,13 +156,13 @@ func get_shuffled_active_validator_indices*(
   withState(state):
     cache.get_shuffled_active_validator_indices(forkyState.data, epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_active_validator_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_active_validator_indices
 func count_active_validators*(state: ForkyBeaconState,
                               epoch: Epoch,
                               cache: var StateCache): uint64 =
   cache.get_shuffled_active_validator_indices(state, epoch).lenu64
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_committee_count_per_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_committee_count_per_slot
 func get_committee_count_per_slot*(num_active_validators: uint64): uint64 =
   clamp(
     num_active_validators div SLOTS_PER_EPOCH div TARGET_COMMITTEE_SIZE,
@@ -187,7 +187,7 @@ iterator get_committee_indices*(committee_count_per_slot: uint64): CommitteeInde
     let committee_index = CommitteeIndex.init(idx).expect("value clamped")
     yield committee_index
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_committee
 func compute_committee_slice*(
     active_validators, index, count: uint64): Slice[int] =
   doAssert active_validators <= ValidatorIndex.high.uint64
@@ -233,7 +233,7 @@ func compute_committee_len*(
 
   (slice.b - slice.a + 1).uint64
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_beacon_committee
 iterator get_beacon_committee*(
     state: ForkyBeaconState, slot: Slot, index: CommitteeIndex,
     cache: var StateCache): (int, ValidatorIndex) =
@@ -273,7 +273,7 @@ func get_beacon_committee*(
   withState(state):
     get_beacon_committee(forkyState.data, slot, index, cache)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_beacon_committee
 func get_beacon_committee_len*(
     state: ForkyBeaconState, slot: Slot, index: CommitteeIndex,
     cache: var StateCache): uint64 =
@@ -296,7 +296,7 @@ func get_beacon_committee_len*(
   withState(state):
     get_beacon_committee_len(forkyState.data, slot, index, cache)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_shuffled_index
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_shuffled_index
 func compute_shuffled_index*(
     index: uint64, index_count: uint64, seed: Eth2Digest): uint64 =
   ## Return the shuffled index corresponding to ``seed`` (and ``index_count``).
@@ -331,7 +331,7 @@ func compute_shuffled_index*(
 
   cur_idx_permuted
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#compute_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#compute_proposer_index
 func compute_proposer_index(state: ForkyBeaconState,
     indices: seq[ValidatorIndex], seed: Eth2Digest): Option[ValidatorIndex] =
   ## Return from ``indices`` a random index sampled by effective balance.
@@ -358,7 +358,7 @@ func compute_proposer_index(state: ForkyBeaconState,
       return some(candidate_index)
     i += 1
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_beacon_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_beacon_proposer_index
 func get_beacon_proposer_index*(
     state: ForkyBeaconState, cache: var StateCache, slot: Slot):
     Option[ValidatorIndex] =
@@ -396,7 +396,7 @@ func get_beacon_proposer_index*(
 
     return res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#get_beacon_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#get_beacon_proposer_index
 func get_beacon_proposer_index*(state: ForkyBeaconState, cache: var StateCache):
     Option[ValidatorIndex] =
   get_beacon_proposer_index(state, cache, state.slot)
@@ -407,7 +407,7 @@ func get_beacon_proposer_index*(state: ForkedHashedBeaconState,
   withState(state):
     get_beacon_proposer_index(forkyState.data, cache, slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#aggregation-selection
 func is_aggregator*(committee_len: uint64, slot_signature: ValidatorSig): bool =
   let
     modulo = max(1'u64, committee_len div TARGET_AGGREGATORS_PER_COMMITTEE)
diff --git a/beacon_chain/spec/weak_subjectivity.nim b/beacon_chain/spec/weak_subjectivity.nim
index 136fd40b2..da4b35165 100644
--- a/beacon_chain/spec/weak_subjectivity.nim
+++ b/beacon_chain/spec/weak_subjectivity.nim
@@ -29,7 +29,7 @@ func compute_weak_subjectivity_period(
       SAFETY_DECAY * validator_count div (2 * 100 * cfg.MIN_PER_EPOCH_CHURN_LIMIT)
   return weak_subjectivity_period
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/weak-subjectivity.md#checking-for-stale-weak-subjectivity-checkpoint
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/weak-subjectivity.md#checking-for-stale-weak-subjectivity-checkpoint
 func is_within_weak_subjectivity_period*(cfg: RuntimeConfig, current_slot: Slot,
                                          ws_state: ForkedHashedBeaconState,
                                          ws_checkpoint: Checkpoint): bool =
diff --git a/beacon_chain/sync/light_client_manager.nim b/beacon_chain/sync/light_client_manager.nim
index 0bd9b5e7a..1b9405e98 100644
--- a/beacon_chain/sync/light_client_manager.nim
+++ b/beacon_chain/sync/light_client_manager.nim
@@ -116,7 +116,7 @@ proc isGossipSupported*(
   else:
     period <= finalizedPeriod
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
 proc doRequest(
     e: typedesc[Bootstrap],
     peer: Peer,
@@ -125,7 +125,7 @@ proc doRequest(
     raises: [Defect, IOError].} =
   peer.lightClientBootstrap(blockRoot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
 type LightClientUpdatesByRangeResponse =
   NetRes[List[altair.LightClientUpdate, MAX_REQUEST_LIGHT_CLIENT_UPDATES]]
 proc doRequest(
@@ -166,7 +166,7 @@ proc doRequest(
       inc expectedPeriod
   return response
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
 proc doRequest(
     e: typedesc[FinalityUpdate],
     peer: Peer
@@ -174,7 +174,7 @@ proc doRequest(
     raises: [Defect, IOError].} =
   peer.lightClientFinalityUpdate()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
 proc doRequest(
     e: typedesc[OptimisticUpdate],
     peer: Peer
@@ -388,7 +388,7 @@ func fetchTime(
     jitterDelay = chronos.seconds(self.rng[].rand(jitterSeconds).int64)
   return wallTime + minDelay + jitterDelay
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/light-client.md#light-client-sync-process
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/light-client.md#light-client-sync-process
 proc loop(self: LightClientManager) {.async.} =
   var nextFetchTime = self.getBeaconTime()
   while true:
diff --git a/beacon_chain/sync/sync_protocol.nim b/beacon_chain/sync/sync_protocol.nim
index 0d93acf81..c91cddd00 100644
--- a/beacon_chain/sync/sync_protocol.nim
+++ b/beacon_chain/sync/sync_protocol.nim
@@ -29,7 +29,7 @@ const
 
   blockResponseCost = allowedOpsPerSecondCost(64) # Allow syncing ~64 blocks/sec (minus request costs)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#configuration
   MAX_REQUEST_LIGHT_CLIENT_UPDATES* = 128
   lightClientBootstrapResponseCost = allowedOpsPerSecondCost(1)
     ## Only one bootstrap per peer should ever be needed - no need to allow more
@@ -293,7 +293,7 @@ p2pProtocol BeaconSync(version = 1,
 
     if startSlot.epoch >= dag.cfg.ALTAIR_FORK_EPOCH:
       # "Clients MAY limit the number of blocks in the response."
-      # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#beaconblocksbyrange
+      # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#beaconblocksbyrange
       debug "Block range v1 request for post-altair range",
         peer, startSlot, reqCount, reqStep
       return
@@ -379,7 +379,7 @@ p2pProtocol BeaconSync(version = 1,
       if blockRef.slot.epoch >= dag.cfg.ALTAIR_FORK_EPOCH:
         # Skipping this block should be fine because the spec says:
         # "Clients MAY limit the number of blocks in the response."
-        # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/p2p-interface.md#beaconblocksbyroot
+        # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#beaconblocksbyroot
         #
         # Also, our response would be indistinguishable from a node
         # that have been synced exactly to the altair transition slot.
@@ -534,7 +534,7 @@ p2pProtocol BeaconSync(version = 1,
     debug "Block root request done",
       peer, roots = blockRoots.len, count, found
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
   proc lightClientBootstrap(
       peer: Peer,
       blockRoot: Eth2Digest,
@@ -560,7 +560,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC bootstrap request done", peer, blockRoot
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
   proc lightClientUpdatesByRange(
       peer: Peer,
       startPeriod: SyncCommitteePeriod,
@@ -600,7 +600,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC updates by range request done", peer, startPeriod, count, found
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
   proc lightClientFinalityUpdate(
       peer: Peer,
       response: SingleChunkResponse[altair.LightClientFinalityUpdate])
@@ -626,7 +626,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC finality update request done", peer
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
   proc lightClientOptimisticUpdate(
       peer: Peer,
       response: SingleChunkResponse[altair.LightClientOptimisticUpdate])
diff --git a/beacon_chain/validators/slashing_protection_v2.nim b/beacon_chain/validators/slashing_protection_v2.nim
index 8be5adc20..bc48f4230 100644
--- a/beacon_chain/validators/slashing_protection_v2.nim
+++ b/beacon_chain/validators/slashing_protection_v2.nim
@@ -36,7 +36,7 @@ import
 # - https://notes.ethereum.org/@djrtwo/Bkn3zpwxB#Validator-responsibilities
 #
 # Phase 0 spec - Honest Validator - how to avoid slashing
-# - https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#how-to-avoid-slashing
+# - https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#how-to-avoid-slashing
 #
 # In-depth reading on slashing conditions
 #
@@ -58,7 +58,7 @@ import
 #   2. An attester can get slashed for signing
 #      two attestations that together violate
 #      the Casper FFG slashing conditions.
-# - https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#ffg-vote
+# - https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#ffg-vote
 #   The "source" is the current_justified_epoch
 #   The "target" is the current_epoch
 #
diff --git a/beacon_chain/validators/validator_pool.nim b/beacon_chain/validators/validator_pool.nim
index a177bde7b..86c07cf27 100644
--- a/beacon_chain/validators/validator_pool.nim
+++ b/beacon_chain/validators/validator_pool.nim
@@ -268,7 +268,7 @@ proc signData(v: AttachedValidator,
   else:
     v.signWithDistributedKey(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#signature
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#signature
 proc getBlockSignature*(v: AttachedValidator, fork: Fork,
                         genesis_validators_root: Eth2Digest, slot: Slot,
                         block_root: Eth2Digest,
@@ -312,7 +312,7 @@ proc getBlockSignature*(v: AttachedValidator, fork: Fork,
             fork, genesis_validators_root, web3SignerBlock)
         await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregate-signature
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#aggregate-signature
 proc getAttestationSignature*(v: AttachedValidator, fork: Fork,
                               genesis_validators_root: Eth2Digest,
                               data: AttestationData
@@ -328,7 +328,7 @@ proc getAttestationSignature*(v: AttachedValidator, fork: Fork,
       let request = Web3SignerRequest.init(fork, genesis_validators_root, data)
       await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#broadcast-aggregate
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#broadcast-aggregate
 proc getAggregateAndProofSignature*(v: AttachedValidator,
                                     fork: Fork,
                                     genesis_validators_root: Eth2Digest,
@@ -414,7 +414,7 @@ proc getContributionAndProofSignature*(v: AttachedValidator, fork: Fork,
         fork, genesis_validators_root, contribution_and_proof)
       await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#randao-reveal
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#randao-reveal
 proc getEpochSignature*(v: AttachedValidator, fork: Fork,
                         genesis_validators_root: Eth2Digest, epoch: Epoch
                        ): Future[SignatureResult] {.async.} =
@@ -429,7 +429,7 @@ proc getEpochSignature*(v: AttachedValidator, fork: Fork,
         fork, genesis_validators_root, epoch)
       await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#aggregation-selection
 proc getSlotSignature*(v: AttachedValidator, fork: Fork,
                        genesis_validators_root: Eth2Digest, slot: Slot
                       ): Future[SignatureResult] {.async.} =
diff --git a/docs/attestation_flow.md b/docs/attestation_flow.md
index 8a38884dc..5d4cdf825 100644
--- a/docs/attestation_flow.md
+++ b/docs/attestation_flow.md
@@ -9,7 +9,7 @@ It is important to distinguish attestation `validation` from attestation `verifi
   - Aggregated: https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
   - Unaggregated: https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
 - Attestation `verification` is defined in the consensus specs. Verified attestations can affect fork choice and may be included in a block.
-  - https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#attestations
+  - https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#attestations
 
 From the specs it seems like gossip attestation `validation` is a superset of consensus attestation `verification`.
 
diff --git a/docs/block_flow.md b/docs/block_flow.md
index 84f75782e..59e5a9383 100644
--- a/docs/block_flow.md
+++ b/docs/block_flow.md
@@ -9,7 +9,7 @@ Important distinction:
   https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#beacon_block.
   A validated block can be forwarded on gossipsub.
 - and we distinguish `verification` which is defined in consensus specs:
-  https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#block-processing
+  https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#block-processing
   A block needs to be verified to enter fork choice, the DAG and the BeaconChainDB
 
 In particular in terms of costly checks validating a block only requires checking:
diff --git a/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim b/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim
index b893b3cd6..6f8d1e504 100644
--- a/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim
+++ b/tests/consensus_spec/altair/test_fixture_light_client_sync_protocol.nim
@@ -22,7 +22,7 @@ import
   # Test utilities
   ../../testutil, ../../testblockutil
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/test/helpers/sync_committee.py#L27-L44
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/test/helpers/sync_committee.py#L27-L44
 proc compute_aggregate_sync_committee_signature(
     cfg: RuntimeConfig,
     forked: ForkedHashedBeaconState,
@@ -53,7 +53,7 @@ proc compute_aggregate_sync_committee_signature(
       aggregateSig.aggregate(signature)
   aggregateSig.finish.toValidatorSig
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L32-L62
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L32-L62
 proc get_sync_aggregate(
     cfg: RuntimeConfig,
     forked: ForkedHashedBeaconState,
@@ -137,7 +137,7 @@ let full_sync_committee_bits = block:
   res.bytes.fill(byte.high)
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L20-L29
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L20-L29
 func initialize_light_client_store(state: auto): LightClientStore =
   LightClientStore(
     finalized_header: BeaconBlockHeader(),
@@ -157,7 +157,7 @@ suite "EF - Altair - Unittests - Light client - Sync protocol" & preset():
       res
     genesisState = newClone(initGenesisState(cfg = cfg))
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L23-L60
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L23-L60
   test "test_process_light_client_update_not_timeout":
     let forked = assignClone(genesisState[])
     template state(): auto = forked[].altairData.data
@@ -203,7 +203,7 @@ suite "EF - Altair - Unittests - Light client - Sync protocol" & preset():
       store.optimistic_header == update.attested_header
       store.current_max_active_participants > 0
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L63-L104
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L63-L104
   test "test_process_light_client_update_at_period_boundary":
     var forked = assignClone(genesisState[])
     template state(): auto = forked[].altairData.data
@@ -256,7 +256,7 @@ suite "EF - Altair - Unittests - Light client - Sync protocol" & preset():
       store.optimistic_header == update.attested_header
       store.current_max_active_participants > 0
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L107-L149
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L107-L149
   test "process_light_client_update_timeout":
     let forked = assignClone(genesisState[])
     template state(): auto = forked[].altairData.data
@@ -312,7 +312,7 @@ suite "EF - Altair - Unittests - Light client - Sync protocol" & preset():
       store.optimistic_header == update.attested_header
       store.current_max_active_participants > 0
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L152-L201
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L152-L201
   test "process_light_client_update_finality_updated":
     let forked = assignClone(genesisState[])
     template state(): auto = forked[].altairData.data
diff --git a/tests/consensus_spec/fixtures_utils.nim b/tests/consensus_spec/fixtures_utils.nim
index 7ba0c2972..39cabbdf7 100644
--- a/tests/consensus_spec/fixtures_utils.nim
+++ b/tests/consensus_spec/fixtures_utils.nim
@@ -69,7 +69,7 @@ type
     rewards*: List[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
     penalties*: List[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#eth1block
+  # https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#eth1block
   Eth1Block* = object
     timestamp*: uint64
     deposit_root*: Eth2Digest
diff --git a/tests/spec_block_processing/test_process_deposits.nim b/tests/spec_block_processing/test_process_deposits.nim
index 467a4aa37..1fbcdfa27 100644
--- a/tests/spec_block_processing/test_process_deposits.nim
+++ b/tests/spec_block_processing/test_process_deposits.nim
@@ -7,7 +7,7 @@
 
 
 # process_deposit (beaconstate.nim)
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#deposits
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/beacon-chain.md#deposits
 # ---------------------------------------------------------------
 
 {.used.}