From c65eaca1bf19350766318319f8d44f4906287867 Mon Sep 17 00:00:00 2001
From: tersec <tersec@users.noreply.github.com>
Date: Sat, 20 Aug 2022 16:03:32 +0000
Subject: [PATCH] update spec ref URLs (#4005)

---
 beacon_chain/beacon_chain_db_immutable.nim    |  4 +-
 beacon_chain/beacon_clock.nim                 |  2 +-
 .../consensus_object_pools/block_dag.nim      |  2 +-
 .../consensus_object_pools/blockchain_dag.nim |  2 +-
 .../consensus_manager.nim                     |  2 +-
 .../consensus_object_pools/spec_cache.nim     | 14 ++--
 beacon_chain/eth1/merkle_minimal.nim          |  2 +-
 beacon_chain/fork_choice/fork_choice.nim      | 10 +--
 beacon_chain/fork_choice/proto_array.nim      |  4 +-
 .../gossip_processing/block_processor.nim     |  4 +-
 .../gossip_processing/eth2_processor.nim      |  4 +-
 .../gossip_processing/gossip_validation.nim   | 12 ++--
 .../light_client_processor.nim                |  4 +-
 beacon_chain/networking/eth2_network.nim      |  4 +-
 beacon_chain/rpc/rest_config_api.nim          | 10 +--
 beacon_chain/spec/beacon_time.nim             | 14 ++--
 beacon_chain/spec/beaconstate.nim             | 66 +++++++++----------
 beacon_chain/spec/crypto.nim                  |  6 +-
 beacon_chain/spec/datatypes/altair.nim        | 36 +++++-----
 beacon_chain/spec/datatypes/base.nim          | 50 +++++++-------
 beacon_chain/spec/datatypes/bellatrix.nim     |  4 +-
 beacon_chain/spec/datatypes/phase0.nim        | 10 +--
 beacon_chain/spec/digest.nim                  |  2 +-
 beacon_chain/spec/eth2_apis/rest_types.nim    | 10 +--
 beacon_chain/spec/forks.nim                   |  4 +-
 beacon_chain/spec/helpers.nim                 | 36 +++++-----
 beacon_chain/spec/light_client_sync.nim       | 10 +--
 beacon_chain/spec/network.nim                 | 12 ++--
 beacon_chain/spec/presets.nim                 |  2 +-
 .../spec/presets/mainnet/altair_preset.nim    |  2 +-
 .../spec/presets/mainnet/bellatrix_preset.nim |  2 +-
 .../spec/presets/mainnet/phase0_preset.nim    |  2 +-
 .../spec/presets/minimal/altair_preset.nim    |  2 +-
 .../spec/presets/minimal/bellatrix_preset.nim |  2 +-
 beacon_chain/spec/signatures.nim              |  2 +-
 beacon_chain/spec/signatures_batch.nim        |  4 +-
 beacon_chain/spec/state_transition.nim        | 10 +--
 beacon_chain/spec/state_transition_block.nim  | 34 +++++-----
 beacon_chain/spec/validator.nim               | 22 +++----
 beacon_chain/spec/weak_subjectivity.nim       |  2 +-
 beacon_chain/sync/light_client_manager.nim    | 10 +--
 beacon_chain/sync/sync_protocol.nim           | 10 +--
 docs/attestation_flow.md                      |  2 +-
 docs/block_flow.md                            |  2 +-
 ...est_fixture_light_client_sync_protocol.nim | 12 ++--
 tests/mocking/mock_blocks.nim                 |  8 +--
 .../test_process_deposits.nim                 |  2 +-
 tests/testblockutil.nim                       |  2 +-
 48 files changed, 237 insertions(+), 237 deletions(-)

diff --git a/beacon_chain/beacon_chain_db_immutable.nim b/beacon_chain/beacon_chain_db_immutable.nim
index eb5d8a1bb..3edf888d8 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-rc.2/specs/phase0/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 a41ac14d7..85bd5180b 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-rc.2/specs/phase0/fork-choice.md#fork-choice
+    ## https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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/block_dag.nim b/beacon_chain/consensus_object_pools/block_dag.nim
index 6de84bc61..fd57bfa01 100644
--- a/beacon_chain/consensus_object_pools/block_dag.nim
+++ b/beacon_chain/consensus_object_pools/block_dag.nim
@@ -126,7 +126,7 @@ 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-rc.2/specs/phase0/fork-choice.md#get_ancestor
+  ## https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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/blockchain_dag.nim b/beacon_chain/consensus_object_pools/blockchain_dag.nim
index b93635ee7..20da9bb91 100644
--- a/beacon_chain/consensus_object_pools/blockchain_dag.nim
+++ b/beacon_chain/consensus_object_pools/blockchain_dag.nim
@@ -2029,7 +2029,7 @@ proc aggregateAll*(
     # 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-rc.2/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+    # - https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
     return err("aggregate: no attesting keys")
 
   let
diff --git a/beacon_chain/consensus_object_pools/consensus_manager.nim b/beacon_chain/consensus_object_pools/consensus_manager.nim
index bd692117d..b9b421003 100644
--- a/beacon_chain/consensus_object_pools/consensus_manager.nim
+++ b/beacon_chain/consensus_object_pools/consensus_manager.nim
@@ -97,7 +97,7 @@ proc runForkchoiceUpdated*(
   # block hash provided by this event is stubbed with
   # `0x0000000000000000000000000000000000000000000000000000000000000000`."
   # and
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/bellatrix/validator.md#executionpayload
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/validator.md#executionpayload
   # notes "`finalized_block_hash` is the hash of the latest finalized execution
   # payload (`Hash32()` if none yet finalized)"
   doAssert not headBlockRoot.isZero
diff --git a/beacon_chain/consensus_object_pools/spec_cache.nim b/beacon_chain/consensus_object_pools/spec_cache.nim
index 73639a498..0d3741dc5 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-rc.2/specs/phase0/beacon-chain.md#get_committee_count_per_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_attesting_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_attesting_indices
 iterator get_attesting_indices*(shufflingRef: ShufflingRef,
                                 slot: Slot,
                                 committee_index: CommitteeIndex,
@@ -142,7 +142,7 @@ func get_attesting_indices_one*(shufflingRef: ShufflingRef,
     res = some(validator_index)
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_attesting_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_attesting_indices
 func get_attesting_indices*(shufflingRef: ShufflingRef,
                             slot: Slot,
                             committee_index: CommitteeIndex,
@@ -152,7 +152,7 @@ func get_attesting_indices*(shufflingRef: ShufflingRef,
   for idx in get_attesting_indices(shufflingRef, slot, committee_index, bits):
     result.add(idx)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
 proc is_valid_indexed_attestation*(
     fork: Fork, genesis_validators_root: Eth2Digest,
     dag: ChainDAGRef, shufflingRef: EpochRef,
diff --git a/beacon_chain/eth1/merkle_minimal.nim b/beacon_chain/eth1/merkle_minimal.nim
index f311c0ad6..3673b4ad6 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-rc.2/tests/core/pyspec/eth2spec/utils/merkle_minimal.py
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 3b15a405e..0dbd1452e 100644
--- a/beacon_chain/fork_choice/fork_choice.nim
+++ b/beacon_chain/fork_choice/fork_choice.nim
@@ -81,7 +81,7 @@ 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-rc.2/specs/phase0/fork-choice.md#should_update_justified_checkpoint
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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] =
@@ -135,7 +135,7 @@ proc update_justified(
   self.update_justified(dag, blck, justified.epoch)
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/fork-choice.md#on_block
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/fork-choice.md#on_block
 proc update_checkpoints(
     self: var Checkpoints, dag: ChainDAGRef,
     checkpoints: FinalityCheckpoints): FcResult[void] =
@@ -158,7 +158,7 @@ proc update_checkpoints(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/fork-choice.md#on_tick
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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.
@@ -287,7 +287,7 @@ proc on_attestation*(
       block_root: beacon_block_root))
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/fork-choice.md#on_attester_slashing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/fork-choice.md#on_attester_slashing
 func process_equivocation*(
        self: var ForkChoice,
        validator_index: ValidatorIndex
@@ -303,7 +303,7 @@ func process_equivocation*(
     trace "Integrating equivocation in fork choice",
       validator_index
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/fork-choice.md#on_block
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/fork-choice.md#on_block
 func process_block*(self: var ForkChoiceBackend,
                     block_root: Eth2Digest,
                     parent_root: Eth2Digest,
diff --git a/beacon_chain/fork_choice/proto_array.nim b/beacon_chain/fork_choice/proto_array.nim
index 885173f52..515d0befc 100644
--- a/beacon_chain/fork_choice/proto_array.nim
+++ b/beacon_chain/fork_choice/proto_array.nim
@@ -100,7 +100,7 @@ func init*(T: type ProtoArray, checkpoints: FinalityCheckpoints): T =
     nodes: ProtoNodes(buf: @[node], offset: 0),
     indices: {node.root: 0}.toTable())
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/fork-choice.md#configuration
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/fork-choice.md#configuration
 # https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/fork-choice.md#get_latest_attesting_balance
 const PROPOSER_SCORE_BOOST* = 40
 func calculateProposerBoost(validatorBalances: openArray[Gwei]): int64 =
@@ -517,7 +517,7 @@ 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-rc.2/specs/phase0/fork-choice.md#filter_block_tree
+  ## https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/fork-choice.md#filter_block_tree
   ##
   ## Any node that has a different finalized or justified epoch
   ## should not be viable for the head.
diff --git a/beacon_chain/gossip_processing/block_processor.nim b/beacon_chain/gossip_processing/block_processor.nim
index 2ee8624cc..2f891d195 100644
--- a/beacon_chain/gossip_processing/block_processor.nim
+++ b/beacon_chain/gossip_processing/block_processor.nim
@@ -518,7 +518,7 @@ proc runQueueProcessingLoop*(self: ref BlockProcessor) {.async.} =
                self.consensusManager.eth1Monitor, executionPayload)
 
              if executionPayloadStatus.isNone:
-               # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/sync/optimistic.md#execution-engine-errors
+               # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/sync/optimistic.md#execution-engine-errors
                if not blck.resfut.isNil:
                  blck.resfut.complete(
                    Result[void, BlockError].err(BlockError.MissingParent))
@@ -528,7 +528,7 @@ proc runQueueProcessingLoop*(self: ref BlockProcessor) {.async.} =
            except CatchableError as err:
              error "runQueueProcessingLoop: newPayload failed",
                err = err.msg
-             # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/sync/optimistic.md#execution-engine-errors
+             # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/sync/optimistic.md#execution-engine-errors
              if not blck.resfut.isNil:
                blck.resfut.complete(
                  Result[void, BlockError].err(BlockError.MissingParent))
diff --git a/beacon_chain/gossip_processing/eth2_processor.nim b/beacon_chain/gossip_processing/eth2_processor.nim
index 20921433a..a6734dcb0 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-rc.2/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/sync-protocol.md#process_light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 354b62a7b..a89ced7af 100644
--- a/beacon_chain/gossip_processing/gossip_validation.nim
+++ b/beacon_chain/gossip_processing/gossip_validation.nim
@@ -178,7 +178,7 @@ template validateBeaconBlockBellatrix(
     parent: BlockRef): untyped =
   discard
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/bellatrix/p2p-interface.md#beacon_block
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/p2p-interface.md#beacon_block
 template validateBeaconBlockBellatrix(
        signed_beacon_block: bellatrix.SignedBeaconBlock,
        parent: BlockRef): untyped =
@@ -218,7 +218,7 @@ template validateBeaconBlockBellatrix(
       return errReject("BeaconBlock: execution payload would build on optimistic parent")
 
 # 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-rc.2/specs/bellatrix/p2p-interface.md#beacon_block
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/p2p-interface.md#beacon_block
 proc validateBeaconBlock*(
     dag: ChainDAGRef, quarantine: ref Quarantine,
     signed_beacon_block: phase0.SignedBeaconBlock | altair.SignedBeaconBlock |
@@ -297,7 +297,7 @@ 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-rc.2/specs/bellatrix/p2p-interface.md#beacon_block
+      # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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
@@ -831,7 +831,7 @@ proc validateVoluntaryExit*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/p2p-interface.md#sync_committee_subnet_id
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/p2p-interface.md#sync_committee_subnet_id
 proc validateSyncCommitteeMessage*(
     dag: ChainDAGRef,
     batchCrypto: ref BatchCrypto,
@@ -1036,7 +1036,7 @@ proc validateContribution*(
 
   return ok((sig, participants))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/p2p-interface.md#light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#light_client_finality_update
 proc validateLightClientFinalityUpdate*(
     pool: var LightClientPool, dag: ChainDAGRef,
     finality_update: altair.LightClientFinalityUpdate,
@@ -1064,7 +1064,7 @@ proc validateLightClientFinalityUpdate*(
   pool.latestForwardedFinalitySlot = finalized_slot
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 e0d777790..77ebeb3d4 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-rc.2/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 41219dee9..416603392 100644
--- a/beacon_chain/networking/eth2_network.nim
+++ b/beacon_chain/networking/eth2_network.nim
@@ -2127,7 +2127,7 @@ proc getPersistentNetKeys*(
 func gossipId(
     data: openArray[byte], altairPrefix, topic: string): seq[byte] =
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#topics-and-messages
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/p2p-interface.md#topics-and-messages
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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]
@@ -2493,7 +2493,7 @@ 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-rc.2/specs/altair/p2p-interface.md#transitioning-the-gossip
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 5297b9c0a..24b4192a8 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-rc.2/presets/mainnet/phase0.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/presets/mainnet/altair.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/presets/mainnet/bellatrix.yaml
+          # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#constants
+          # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/beacon-chain.md#constants
+          # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#constants
           TIMELY_SOURCE_FLAG_INDEX:
             to0xHex([byte(TIMELY_SOURCE_FLAG_INDEX)]),
           TIMELY_TARGET_FLAG_INDEX:
diff --git a/beacon_chain/spec/beacon_time.nim b/beacon_chain/spec/beacon_time.nim
index 80e5200fd..f33cac0c0 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-rc.2/specs/phase0/fork-choice.md#constant
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/fork-choice.md#constant
   INTERVALS_PER_SLOT* = 3
 
   FAR_FUTURE_BEACON_TIME* = BeaconTime(ns_since_genesis: int64.high())
@@ -149,10 +149,10 @@ const
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/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-rc.2/specs/altair/light-client/p2p-interface.md#sync-committee
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/p2p-interface.md#sync-committee
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#sync-committee
   lightClientOptimisticUpdateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
 
@@ -186,13 +186,13 @@ func slotOrZero*(time: BeaconTime): Slot =
   if exSlot.afterGenesis: exSlot.slot
   else: Slot(0)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_epoch_at_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/fork-choice.md#compute_slots_since_epoch_start
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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)
@@ -200,14 +200,14 @@ 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-rc.2/specs/phase0/beacon-chain.md#compute_start_slot_at_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_previous_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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/beaconstate.nim b/beacon_chain/spec/beaconstate.nim
index 7cb8c13be..90a7b19bf 100644
--- a/beacon_chain/spec/beaconstate.nim
+++ b/beacon_chain/spec/beaconstate.nim
@@ -21,7 +21,7 @@ import
 
 export extras, forks, validator
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#increase_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#increase_balance
 func increase_balance*(balance: var Gwei, delta: Gwei) =
   balance += delta
 
@@ -31,7 +31,7 @@ func increase_balance*(
   if delta != 0: # avoid dirtying the balance cache if not needed
     increase_balance(state.balances.mitem(index), delta)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#decrease_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#decrease_balance
 func decrease_balance*(balance: var Gwei, delta: Gwei) =
   balance =
     if delta > balance:
@@ -46,8 +46,8 @@ func decrease_balance*(
   if delta != 0: # avoid dirtying the balance cache if not needed
     decrease_balance(state.balances.mitem(index), delta)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#deposits
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#modified-process_deposit
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#deposits
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#modified-process_deposit
 func get_validator_from_deposit*(deposit: DepositData):
     Validator =
   let
@@ -65,13 +65,13 @@ func get_validator_from_deposit*(deposit: DepositData):
     effective_balance: effective_balance
   )
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_activation_exit_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#compute_activation_exit_epoch
 func compute_activation_exit_epoch*(epoch: Epoch): Epoch =
   ## Return the epoch during which validator activations and exits initiated in
   ## ``epoch`` take effect.
   epoch + 1 + MAX_SEED_LOOKAHEAD
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_validator_churn_limit
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_validator_churn_limit
 func get_validator_churn_limit*(
       cfg: RuntimeConfig, state: ForkyBeaconState, cache: var StateCache):
     uint64 =
@@ -81,7 +81,7 @@ func get_validator_churn_limit*(
     count_active_validators(
       state, state.get_current_epoch(), cache) div cfg.CHURN_LIMIT_QUOTIENT)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#initiate_validator_exit
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#initiate_validator_exit
 func initiate_validator_exit*(
     cfg: RuntimeConfig, state: var ForkyBeaconState,
     index: ValidatorIndex, cache: var StateCache): Result[void, cstring] =
@@ -130,8 +130,8 @@ func initiate_validator_exit*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#modified-slash_validator
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#modified-slash_validator
 func get_slashing_penalty*(state: ForkyBeaconState,
                            validator_effective_balance: Gwei): Gwei =
@@ -146,14 +146,14 @@ func get_slashing_penalty*(state: ForkyBeaconState,
   else:
     {.fatal: "invalid BeaconState type".}
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#modified-slash_validator
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#modified-slash_validator
 func get_whistleblower_reward*(validator_effective_balance: Gwei): Gwei =
   validator_effective_balance div WHISTLEBLOWER_REWARD_QUOTIENT
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#modified-slash_validator
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#modified-slash_validator
 func get_proposer_reward(state: ForkyBeaconState, whistleblower_reward: Gwei): Gwei =
   when state is phase0.BeaconState:
@@ -163,8 +163,8 @@ func get_proposer_reward(state: ForkyBeaconState, whistleblower_reward: Gwei): G
   else:
     {.fatal: "invalid BeaconState type".}
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#slash_validator
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#modified-slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#slash_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#modified-slash_validator
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#modified-slash_validator
 proc slash_validator*(
     cfg: RuntimeConfig, state: var ForkyBeaconState,
@@ -218,7 +218,7 @@ proc slash_validator*(
 func genesis_time_from_eth1_timestamp*(cfg: RuntimeConfig, eth1_timestamp: uint64): uint64 =
   eth1_timestamp + cfg.GENESIS_DELAY
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#genesis
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#genesis
 proc initialize_beacon_state_from_eth1*(
     cfg: RuntimeConfig,
     eth1_block_hash: Eth2Digest,
@@ -320,7 +320,7 @@ proc initialize_hashed_beacon_state_from_eth1*(
       cfg, eth1_block_hash, eth1_timestamp, deposits, flags))
   result.root = hash_tree_root(result.data)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#genesis-block
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#genesis-block
 func get_initial_beacon_block*(state: phase0.HashedBeaconState):
     phase0.TrustedSignedBeaconBlock =
   # The genesis block is implicitly trusted
@@ -332,7 +332,7 @@ func get_initial_beacon_block*(state: phase0.HashedBeaconState):
   phase0.TrustedSignedBeaconBlock(
     message: message, root: hash_tree_root(message))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#initialize-state-for-pure-altair-testnets-and-test-vectors
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#initialize-state-for-pure-altair-testnets-and-test-vectors
 func get_initial_beacon_block*(state: altair.HashedBeaconState):
     altair.TrustedSignedBeaconBlock =
   # The genesis block is implicitly trusted
@@ -361,7 +361,7 @@ func get_initial_beacon_block*(state: ForkedHashedBeaconState):
   withState(state):
     ForkedTrustedSignedBeaconBlock.init(get_initial_beacon_block(state))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_block_root_at_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_block_root_at_slot
 func get_block_root_at_slot*(state: ForkyBeaconState, slot: Slot): Eth2Digest =
   ## Return the block root at a recent ``slot``.
 
@@ -379,7 +379,7 @@ func get_block_root_at_slot*(
   withState(state):
     get_block_root_at_slot(state.data, slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_block_root
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_block_root
 func get_block_root*(state: ForkyBeaconState, epoch: Epoch): Eth2Digest =
   ## Return the block root at the start of a recent ``epoch``.
   get_block_root_at_slot(state, epoch.start_slot())
@@ -389,7 +389,7 @@ func get_block_root*(state: ForkedHashedBeaconState, epoch: Epoch): Eth2Digest =
   withState(state):
     get_block_root(state.data, epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_total_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_total_balance
 template get_total_balance(
     state: ForkyBeaconState, validator_indices: untyped): Gwei =
   ## Return the combined effective balance of the ``indices``.
@@ -400,13 +400,13 @@ template get_total_balance(
     res += state.validators[validator_index].effective_balance
   max(EFFECTIVE_BALANCE_INCREMENT, res)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#is_eligible_for_activation_queue
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#is_eligible_for_activation_queue
 func is_eligible_for_activation_queue*(validator: Validator): bool =
   ## Check if ``validator`` is eligible to be placed into the activation queue.
   validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH and
     validator.effective_balance == MAX_EFFECTIVE_BALANCE
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#is_eligible_for_activation
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#is_eligible_for_activation
 func is_eligible_for_activation*(
     state: ForkyBeaconState, validator: Validator): bool =
   ## Check if ``validator`` is eligible for activation.
@@ -416,7 +416,7 @@ func is_eligible_for_activation*(
   # Has not yet been activated
     validator.activation_epoch == FAR_FUTURE_EPOCH
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
 proc is_valid_indexed_attestation*(
     state: ForkyBeaconState, indexed_attestation: SomeIndexedAttestation,
     flags: UpdateFlags): Result[void, cstring] =
@@ -454,7 +454,7 @@ proc is_valid_indexed_attestation*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_attesting_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_attesting_indices
 func get_attesting_indices*(state: ForkyBeaconState,
                             data: AttestationData,
                             bits: CommitteeValidatorsBits,
@@ -519,7 +519,7 @@ proc is_valid_indexed_attestation*(
 
 # Attestation validation
 # ------------------------------------------------------------------------------------------
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#attestations
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#attestations
 # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
 
 func check_attestation_slot_target*(data: AttestationData): Result[Slot, cstring] =
@@ -562,7 +562,7 @@ func check_attestation_index*(
     Result[CommitteeIndex, cstring] =
   check_attestation_index(data.index, committees_per_slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#get_attestation_participation_flag_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#get_attestation_participation_flag_indices
 func get_attestation_participation_flag_indices(state: altair.BeaconState | bellatrix.BeaconState,
                                                 data: AttestationData,
                                                 inclusion_delay: uint64): seq[int] =
@@ -596,7 +596,7 @@ func get_attestation_participation_flag_indices(state: altair.BeaconState | bell
 # TODO these duplicate some stuff in state_transition_epoch which uses TotalBalances
 # better to centralize around that if feasible
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_total_active_balance
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_total_active_balance
 func get_total_active_balance*(state: ForkyBeaconState, cache: var StateCache): Gwei =
   ## Return the combined effective balance of the active validators.
   # Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei
@@ -607,7 +607,7 @@ func get_total_active_balance*(state: ForkyBeaconState, cache: var StateCache):
   get_total_balance(
     state, cache.get_shuffled_active_validator_indices(state, epoch))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#get_base_reward_per_increment
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#get_base_reward_per_increment
 func get_base_reward_per_increment_sqrt*(
     total_active_balance_sqrt: uint64): Gwei =
   EFFECTIVE_BALANCE_INCREMENT * BASE_REWARD_FACTOR div total_active_balance_sqrt
@@ -616,7 +616,7 @@ func get_base_reward_per_increment*(
     total_active_balance: Gwei): Gwei =
   get_base_reward_per_increment_sqrt(integer_squareroot(total_active_balance))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#get_base_reward
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#get_base_reward
 func get_base_reward(
     state: altair.BeaconState | bellatrix.BeaconState, index: ValidatorIndex,
     base_reward_per_increment: Gwei): Gwei =
@@ -626,7 +626,7 @@ func get_base_reward(
     state.validators[index].effective_balance div EFFECTIVE_BALANCE_INCREMENT
   increments * base_reward_per_increment
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#attestations
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#attestations
 proc check_attestation*(
     state: ForkyBeaconState, attestation: SomeAttestation, flags: UpdateFlags,
     cache: var StateCache): Result[void, cstring] =
@@ -740,7 +740,7 @@ proc process_attestation*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#get_next_sync_committee_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#get_next_sync_committee_indices
 func get_next_sync_committee_keys(state: altair.BeaconState | bellatrix.BeaconState):
     array[SYNC_COMMITTEE_SIZE, ValidatorPubKey] =
   ## Return the sequence of sync committee indices, with possible duplicates,
@@ -776,7 +776,7 @@ func get_next_sync_committee_keys(state: altair.BeaconState | bellatrix.BeaconSt
     i += 1'u64
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#get_next_sync_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#get_next_sync_committee
 func get_next_sync_committee*(state: altair.BeaconState | bellatrix.BeaconState):
     SyncCommittee =
   ## Return the *next* sync committee for a given ``state``.
diff --git a/beacon_chain/spec/crypto.nim b/beacon_chain/spec/crypto.nim
index b58d7573a..ce3947b20 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-rc.2/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#bls-signatures
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#bls-signatures
 proc blsVerify*(
     pubkey: ValidatorPubKey, message: openArray[byte],
     signature: CookedSig): bool =
diff --git a/beacon_chain/spec/datatypes/altair.nim b/beacon_chain/spec/datatypes/altair.nim
index fc08ed8e7..1f31e9d84 100644
--- a/beacon_chain/spec/datatypes/altair.nim
+++ b/beacon_chain/spec/datatypes/altair.nim
@@ -30,7 +30,7 @@ from ssz_serialization/proofs import GeneralizedIndex
 export proofs.GeneralizedIndex
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#incentivization-weights
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#incentivization-weights
   TIMELY_SOURCE_WEIGHT* = 14
   TIMELY_TARGET_WEIGHT* = 26
   TIMELY_HEAD_WEIGHT* = 14
@@ -45,22 +45,22 @@ const
   TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE* = 16
   SYNC_COMMITTEE_SUBNET_COUNT* = 4
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#constants
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#constants
   # All of these indices are rooted in `BeaconState`.
   # The first member (`genesis_time`) is 32, subsequent members +1 each.
   # If there are ever more than 32 members in `BeaconState`, indices change!
   # `FINALIZED_ROOT_INDEX` is one layer deeper, i.e., `52 * 2 + 1`.
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/ssz/merkle-proofs.md
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/ssz/merkle-proofs.md
   FINALIZED_ROOT_INDEX* = 105.GeneralizedIndex # `finalized_checkpoint` > `root`
   CURRENT_SYNC_COMMITTEE_INDEX* = 54.GeneralizedIndex # `current_sync_committee`
   NEXT_SYNC_COMMITTEE_INDEX* = 55.GeneralizedIndex # `next_sync_committee`
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#participation-flag-indices
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#participation-flag-indices
   TIMELY_SOURCE_FLAG_INDEX* = 0
   TIMELY_TARGET_FLAG_INDEX* = 1
   TIMELY_HEAD_FLAG_INDEX* = 2
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#inactivity-penalties
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#inactivity-penalties
   INACTIVITY_SCORE_BIAS* = 4
   INACTIVITY_SCORE_RECOVERY_RATE* = 16
 
@@ -74,13 +74,13 @@ static: doAssert TIMELY_SOURCE_WEIGHT + TIMELY_TARGET_WEIGHT +
 type
   ### New types
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#custom-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#custom-types
   ParticipationFlags* = uint8
 
   EpochParticipationFlags* =
     distinct HashList[ParticipationFlags, Limit VALIDATOR_REGISTRY_LIMIT]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#syncaggregate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#syncaggregate
   SyncAggregate* = object
     sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
     sync_committee_signature*: ValidatorSig
@@ -89,7 +89,7 @@ type
     sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
     sync_committee_signature*: TrustedSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#synccommittee
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#synccommittee
   SyncCommittee* = object
     pubkeys*: HashArray[Limit SYNC_COMMITTEE_SIZE, ValidatorPubKey]
     aggregate_pubkey*: ValidatorPubKey
@@ -157,7 +157,7 @@ type
   NextSyncCommitteeBranch* =
     array[log2trunc(NEXT_SYNC_COMMITTEE_INDEX), Eth2Digest]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#lightclientbootstrap
   LightClientBootstrap* = object
     header*: BeaconBlockHeader
       ## The requested beacon block header
@@ -166,7 +166,7 @@ type
       ## Current sync committee corresponding to `header`
     current_sync_committee_branch*: CurrentSyncCommitteeBranch
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#lightclientupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#lightclientupdate
   LightClientUpdate* = object
     attested_header*: BeaconBlockHeader
       ## The beacon block header that is attested to by the sync committee
@@ -184,7 +184,7 @@ type
     signature_slot*: Slot
       ## Slot at which the aggregate signature was created (untrusted)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#lightclientfinalityupdate
   LightClientFinalityUpdate* = object
     # The beacon block header that is attested to by the sync committee
     attested_header*: BeaconBlockHeader
@@ -198,7 +198,7 @@ type
     # Slot at which the aggregate signature was created (untrusted)
     signature_slot*: Slot
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#lightclientoptimisticupdate
   LightClientOptimisticUpdate* = object
     # The beacon block header that is attested to by the sync committee
     attested_header*: BeaconBlockHeader
@@ -224,7 +224,7 @@ type
     LightClientBootstrap |
     SomeLightClientUpdate
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#lightclientstore
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#lightclientstore
   LightClientStore* = object
     finalized_header*: BeaconBlockHeader
       ## Beacon block header that is finalized
@@ -244,7 +244,7 @@ type
       ## safety threshold)
     current_max_active_participants*: uint64
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#beaconstate
   BeaconState* = object
     # Versioning
     genesis_time*: uint64
@@ -329,7 +329,7 @@ type
     data*: BeaconState
     root*: Eth2Digest # hash_tree_root(data)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#beaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#beaconblock
   BeaconBlock* = object
     ## For each slot, a proposer is chosen from the validator pool to propose
     ## a new block. Once the block as been proposed, it is transmitted to
@@ -386,7 +386,7 @@ type
     state_root*: Eth2Digest
     body*: TrustedBeaconBlockBody
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#beaconblockbody
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#beaconblockbody
   BeaconBlockBody* = object
     randao_reveal*: ValidatorSig
     eth1_data*: Eth1Data
@@ -435,7 +435,7 @@ type
 
   SyncnetBits* = BitArray[SYNC_COMMITTEE_SUBNET_COUNT]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/p2p-interface.md#metadata
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/p2p-interface.md#metadata
   MetaData* = object
     seq_number*: uint64
     attnets*: AttnetBits
@@ -457,7 +457,7 @@ type
     # [New in Altair]
     sync_aggregate*: TrustedSyncAggregate
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#signedbeaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#signedbeaconblock
   SignedBeaconBlock* = object
     message*: BeaconBlock
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/datatypes/base.nim b/beacon_chain/spec/datatypes/base.nim
index 4bf713b7e..4791f42c0 100644
--- a/beacon_chain/spec/datatypes/base.nim
+++ b/beacon_chain/spec/datatypes/base.nim
@@ -136,7 +136,7 @@ type
   # ---------------------------------------------------------------
   DomainType* = distinct array[4, byte]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#custom-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#custom-types
   Eth2Domain* = array[32, byte]
 
   ValidatorIndex* = distinct uint32
@@ -183,7 +183,7 @@ type
   # SSZ / hashing purposes
   JustificationBits* = distinct uint8
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#proposerslashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#proposerslashing
   ProposerSlashing* = object
     signed_header_1*: SignedBeaconBlockHeader
     signed_header_2*: SignedBeaconBlockHeader
@@ -195,7 +195,7 @@ type
     signed_header_1*: TrustedSignedBeaconBlockHeader
     signed_header_2*: TrustedSignedBeaconBlockHeader
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#attesterslashing
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#attesterslashing
   AttesterSlashing* = object
     attestation_1*: IndexedAttestation
     attestation_2*: IndexedAttestation
@@ -207,7 +207,7 @@ type
     attestation_1*: TrustedIndexedAttestation
     attestation_2*: TrustedIndexedAttestation
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#indexedattestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#indexedattestation
   IndexedAttestation* = object
     attesting_indices*: List[uint64, Limit MAX_VALIDATORS_PER_COMMITTEE]
     data*: AttestationData
@@ -223,7 +223,7 @@ type
 
   CommitteeValidatorsBits* = BitList[Limit MAX_VALIDATORS_PER_COMMITTEE]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#attestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#attestation
   Attestation* = object
     aggregation_bits*: CommitteeValidatorsBits
     data*: AttestationData
@@ -239,17 +239,17 @@ type
 
   ForkDigest* = distinct array[4, byte]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#forkdata
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#checkpoint
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#checkpoint
   Checkpoint* = object
     epoch*: Epoch
     root*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#AttestationData
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#AttestationData
   AttestationData* = object
     slot*: Slot
 
@@ -262,20 +262,20 @@ type
     source*: Checkpoint
     target*: Checkpoint
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#deposit
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#depositmessage
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#depositdata
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#depositdata
   DepositData* = object
     pubkey*: ValidatorPubKey
     withdrawal_credentials*: Eth2Digest
@@ -284,7 +284,7 @@ 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-rc.2/specs/phase0/beacon-chain.md#voluntaryexit
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#voluntaryexit
   VoluntaryExit* = object
     epoch*: Epoch
       ## Earliest epoch when voluntary exit can be processed
@@ -312,7 +312,7 @@ type
     pubkey*: CookedPubKey
     withdrawal_credentials*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#validator
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#validator
   Validator* = object
     pubkey*: ValidatorPubKey
 
@@ -334,7 +334,7 @@ type
     withdrawable_epoch*: Epoch
       ## When validator can withdraw or transfer funds
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#pendingattestation
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#pendingattestation
   PendingAttestation* = object
     aggregation_bits*: CommitteeValidatorsBits
     data*: AttestationData
@@ -343,12 +343,12 @@ type
 
     proposer_index*: uint64 # `ValidatorIndex` after validation
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#historicalbatch
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#fork
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#fork
   Fork* = object
     previous_version*: Version
     current_version*: Version
@@ -356,13 +356,13 @@ type
     epoch*: Epoch
       ## Epoch of latest fork
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#eth1data
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#signedvoluntaryexit
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#signedvoluntaryexit
   SignedVoluntaryExit* = object
     message*: VoluntaryExit
     signature*: ValidatorSig
@@ -371,7 +371,7 @@ type
     message*: VoluntaryExit
     signature*: TrustedSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#beaconblockheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#beaconblockheader
   BeaconBlockHeader* = object
     slot*: Slot
     proposer_index*: uint64 # `ValidatorIndex` after validation
@@ -379,14 +379,14 @@ type
     state_root*: Eth2Digest
     body_root*: Eth2Digest
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#signingdata
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#signedbeaconblockheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#signedbeaconblockheader
   SignedBeaconBlockHeader* = object
     message*: BeaconBlockHeader
     signature*: ValidatorSig
@@ -418,12 +418,12 @@ 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-rc.2/solidity_deposit_contract/deposit_contract.sol
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#validator
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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
@@ -514,7 +514,7 @@ type
     flags*: set[RewardFlags]
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#domain-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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])
@@ -524,7 +524,7 @@ 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-rc.2/specs/altair/beacon-chain.md#domain-types
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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])
diff --git a/beacon_chain/spec/datatypes/bellatrix.nim b/beacon_chain/spec/datatypes/bellatrix.nim
index 2ab9cb708..0465cd440 100644
--- a/beacon_chain/spec/datatypes/bellatrix.nim
+++ b/beacon_chain/spec/datatypes/bellatrix.nim
@@ -164,7 +164,7 @@ type
     data*: BeaconState
     root*: Eth2Digest # hash_tree_root(data)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#beaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#beaconblock
   BeaconBlock* = object
     ## For each slot, a proposer is chosen from the validator pool to propose
     ## a new block. Once the block as been proposed, it is transmitted to
@@ -290,7 +290,7 @@ type
     # Execution
     execution_payload*: ExecutionPayload  # [New in Bellatrix]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#signedbeaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#signedbeaconblock
   SignedBeaconBlock* = object
     message*: BeaconBlock
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/datatypes/phase0.nim b/beacon_chain/spec/datatypes/phase0.nim
index c295d6527..8343fc28c 100644
--- a/beacon_chain/spec/datatypes/phase0.nim
+++ b/beacon_chain/spec/datatypes/phase0.nim
@@ -25,7 +25,7 @@ import
 export base
 
 type
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#beaconstate
   BeaconState* = object
     # Versioning
     genesis_time*: uint64
@@ -75,7 +75,7 @@ type
     current_justified_checkpoint*: Checkpoint
     finalized_checkpoint*: Checkpoint
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_total_balance
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_total_balance
   TotalBalances* = object
     # The total effective balance of all active validators during the _current_
     # epoch.
@@ -112,7 +112,7 @@ type
     data*: BeaconState
     root*: Eth2Digest # hash_tree_root(data)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#beaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#beaconblock
   BeaconBlock* = object
     ## For each slot, a proposer is chosen from the validator pool to propose
     ## a new block. Once the block as been proposed, it is transmitted to
@@ -173,7 +173,7 @@ type
     state_root*: Eth2Digest
     body*: TrustedBeaconBlockBody
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#beaconblockbody
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#beaconblockbody
   BeaconBlockBody* = object
     randao_reveal*: ValidatorSig
     eth1_data*: Eth1Data
@@ -222,7 +222,7 @@ type
     deposits*: List[Deposit, Limit MAX_DEPOSITS]
     voluntary_exits*: List[TrustedSignedVoluntaryExit, Limit MAX_VOLUNTARY_EXITS]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#signedbeaconblock
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#signedbeaconblock
   SignedBeaconBlock* = object
     message*: BeaconBlock
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/digest.nim b/beacon_chain/spec/digest.nim
index 2bb8b892f..c9ac81405 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-rc.2/specs/phase0/beacon-chain.md#hash
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 9db2652d1..4fe1cec3b 100644
--- a/beacon_chain/spec/eth2_apis/rest_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_types.nim
@@ -257,7 +257,7 @@ type
     of BeaconBlockFork.Bellatrix: bellatrixBody*: bellatrix.BeaconBlockBody
 
   RestSpec* = object
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/presets/mainnet/phase0.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/presets/mainnet/phase0.yaml
     MAX_COMMITTEES_PER_SLOT*: uint64
     TARGET_COMMITTEE_SIZE*: uint64
     MAX_VALIDATORS_PER_COMMITTEE*: uint64
@@ -292,7 +292,7 @@ type
     MAX_DEPOSITS*: uint64
     MAX_VOLUNTARY_EXITS*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/presets/mainnet/altair.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/presets/mainnet/altair.yaml
     INACTIVITY_PENALTY_QUOTIENT_ALTAIR*: uint64
     MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR*: uint64
     PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR*: uint64
@@ -301,7 +301,7 @@ type
     MIN_SYNC_COMMITTEE_PARTICIPANTS*: uint64
     UPDATE_TIMEOUT*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/presets/mainnet/bellatrix.yaml
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/presets/mainnet/bellatrix.yaml
     INACTIVITY_PENALTY_QUOTIENT_BELLATRIX*: uint64
     MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX*: uint64
     PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX*: uint64
@@ -343,7 +343,7 @@ type
     DEPOSIT_NETWORK_ID*: uint64
     DEPOSIT_CONTRACT_ADDRESS*: Eth1Address
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#constants
     # GENESIS_SLOT
     # GENESIS_EPOCH
     # FAR_FUTURE_EPOCH
@@ -361,7 +361,7 @@ type
     DOMAIN_SELECTION_PROOF*: DomainType
     DOMAIN_AGGREGATE_AND_PROOF*: DomainType
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#constants
     TIMELY_SOURCE_FLAG_INDEX*: byte
     TIMELY_TARGET_FLAG_INDEX*: byte
     TIMELY_HEAD_FLAG_INDEX*: byte
diff --git a/beacon_chain/spec/forks.nim b/beacon_chain/spec/forks.nim
index 1c80691cb..63b7a09c6 100644
--- a/beacon_chain/spec/forks.nim
+++ b/beacon_chain/spec/forks.nim
@@ -648,7 +648,7 @@ func toBeaconBlockFork*(fork: BeaconStateFork): BeaconBlockFork =
   of BeaconStateFork.Altair:    BeaconBlockFork.Altair
   of BeaconStateFork.Bellatrix: BeaconBlockFork.Bellatrix
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_fork_data_root
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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
@@ -660,7 +660,7 @@ func compute_fork_data_root*(current_version: Version,
     genesis_validators_root: genesis_validators_root
   ))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_fork_digest
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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/helpers.nim b/beacon_chain/spec/helpers.nim
index 09a674f90..463e72e1f 100644
--- a/beacon_chain/spec/helpers.nim
+++ b/beacon_chain/spec/helpers.nim
@@ -43,7 +43,7 @@ func shortLog*(v: FinalityCheckpoints): auto =
 
 chronicles.formatIt FinalityCheckpoints: it.shortLog
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#integer_squareroot
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#integer_squareroot
 func integer_squareroot*(n: SomeInteger): SomeInteger =
   ## Return the largest integer ``x`` such that ``x**2 <= n``.
   doAssert n >= 0'u64
@@ -56,7 +56,7 @@ func integer_squareroot*(n: SomeInteger): SomeInteger =
     y = (x + n div x) div 2
   x
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#is_active_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#is_active_validator
 func is_active_validator*(validator: Validator, epoch: Epoch): bool =
   ## Check if ``validator`` is active
   validator.activation_epoch <= epoch and epoch < validator.exit_epoch
@@ -68,7 +68,7 @@ func is_exited_validator*(validator: Validator, epoch: Epoch): bool =
 func is_withdrawable_validator*(validator: Validator, epoch: Epoch): bool =
   epoch >= validator.withdrawable_epoch
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_active_validator_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_active_validator_indices
 iterator get_active_validator_indices*(state: ForkyBeaconState, epoch: Epoch):
     ValidatorIndex =
   for vidx in state.validators.vindices:
@@ -94,23 +94,23 @@ func get_active_validator_indices_len*(
   withState(state):
     get_active_validator_indices_len(state.data, epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_current_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_current_epoch
 func get_current_epoch*(state: ForkyBeaconState): Epoch =
   ## Return the current epoch.
   state.slot.epoch
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_current_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_current_epoch
 func get_current_epoch*(state: ForkedHashedBeaconState): Epoch =
   ## Return the current epoch.
   withState(state): get_current_epoch(state.data)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_previous_epoch
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_previous_epoch
 func get_previous_epoch*(
     state: ForkyBeaconState | ForkedHashedBeaconState): Epoch =
   ## Return the previous epoch (unless the current epoch is ``GENESIS_EPOCH``).
   get_previous_epoch(get_current_epoch(state))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_randao_mix
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_randao_mix
 func get_randao_mix*(state: ForkyBeaconState, epoch: Epoch): Eth2Digest =
   ## Returns the randao mix at a recent ``epoch``.
   state.randao_mixes[epoch mod EPOCHS_PER_HISTORICAL_VECTOR]
@@ -126,7 +126,7 @@ func uint_to_bytes*(x: uint32): array[4, byte] = toBytesLE(x)
 func uint_to_bytes*(x: uint16): array[2, byte] = toBytesLE(x)
 func uint_to_bytes*(x: uint8): array[1, byte] = toBytesLE(x)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_domain
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#compute_domain
 func compute_domain*(
     domain_type: DomainType,
     fork_version: Version,
@@ -141,7 +141,7 @@ func compute_domain*(
   result[0..3] = domain_type.data
   result[4..31] = fork_data_root.data.toOpenArray(0, 27)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_domain
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_domain
 func get_domain*(
     fork: Fork,
     domain_type: DomainType,
@@ -162,7 +162,7 @@ func get_domain*(
   ## of a message.
   get_domain(state.fork, domain_type, epoch, state.genesis_validators_root)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_signing_root
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#compute_signing_root
 func compute_signing_root*(ssz_object: auto, domain: Eth2Domain): Eth2Digest =
   ## Return the signing root of an object by calculating the root of the
   ## object-domain tree.
@@ -172,7 +172,7 @@ func compute_signing_root*(ssz_object: auto, domain: Eth2Domain): Eth2Digest =
   )
   hash_tree_root(domain_wrapped_object)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_seed
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#get_seed
 func get_seed*(state: ForkyBeaconState, epoch: Epoch, domain_type: DomainType):
     Eth2Digest =
   ## Return the seed at ``epoch``.
@@ -190,42 +190,42 @@ func get_seed*(state: ForkyBeaconState, epoch: Epoch, domain_type: DomainType):
       epoch + EPOCHS_PER_HISTORICAL_VECTOR - MIN_SEED_LOOKAHEAD - 1).data
   eth2digest(seed_input)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#add_flag
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#add_flag
 func add_flag*(flags: ParticipationFlags, flag_index: int): ParticipationFlags =
   let flag = ParticipationFlags(1'u8 shl flag_index)
   flags or flag
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#has_flag
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#has_flag
 func has_flag*(flags: ParticipationFlags, flag_index: int): bool =
   let flag = ParticipationFlags(1'u8 shl flag_index)
   (flags and flag) == flag
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#is_sync_committee_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#is_sync_committee_update
 template is_sync_committee_update*(update: SomeLightClientUpdate): bool =
   when update is SomeLightClientUpdateWithSyncCommittee:
     not isZeroMemory(update.next_sync_committee_branch)
   else:
     false
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#is_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#is_finality_update
 template is_finality_update*(update: SomeLightClientUpdate): bool =
   when update is SomeLightClientUpdateWithFinality:
     not isZeroMemory(update.finality_branch)
   else:
     false
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#is_next_sync_committee_known
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#is_next_sync_committee_known
 template is_next_sync_committee_known*(store: LightClientStore): bool =
   not isZeroMemory(store.next_sync_committee)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#get_safety_threshold
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#get_safety_threshold
 func get_safety_threshold*(store: LightClientStore): uint64 =
   max(
     store.previous_max_active_participants,
     store.current_max_active_participants
   ) div 2
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#is_better_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#is_better_update
 type LightClientUpdateMetadata* = object
   attested_slot*, finalized_slot*, signature_slot*: Slot
   has_sync_committee*, has_finality*: bool
diff --git a/beacon_chain/spec/light_client_sync.nim b/beacon_chain/spec/light_client_sync.nim
index fe7efa63e..347f49ec0 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-rc.2/specs/altair/light-client/sync-protocol.md#initialize_light_client_store
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/sync-protocol.md#validate_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/sync-protocol.md#apply_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/sync-protocol.md#process_light_client_store_force_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#process_light_client_store_force_update
 type
   ForceUpdateResult* = enum
     NoUpdate,
@@ -207,7 +207,7 @@ func process_light_client_store_force_update*(
     store.best_valid_update.reset()
   res
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/sync-protocol.md#process_light_client_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/sync-protocol.md#process_light_client_update
 proc process_light_client_update*(
     store: var LightClientStore,
     update: SomeLightClientUpdate,
diff --git a/beacon_chain/spec/network.nim b/beacon_chain/spec/network.nim
index 12f5676fe..ccd97b7ce 100644
--- a/beacon_chain/spec/network.nim
+++ b/beacon_chain/spec/network.nim
@@ -30,7 +30,7 @@ const
   TTFB_TIMEOUT* = 5.seconds
   RESP_TIMEOUT* = 10.seconds
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/bellatrix/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/p2p-interface.md#configuration
   GOSSIP_MAX_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
   MAX_CHUNK_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
 
@@ -85,23 +85,23 @@ func getAttestationTopic*(forkDigest: ForkDigest,
   ## 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-rc.2/specs/altair/p2p-interface.md#topics-and-messages
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/p2p-interface.md#topics-and-messages
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/p2p-interface.md#light_client_finality_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/p2p-interface.md#transitioning-the-gossip
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 d2db83b69..36295fe59 100644
--- a/beacon_chain/spec/presets.nim
+++ b/beacon_chain/spec/presets.nim
@@ -15,7 +15,7 @@ import
   stew/[byteutils], stint, web3/[ethtypes]
 
 const
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#withdrawal-prefixes
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#withdrawal-prefixes
   BLS_WITHDRAWAL_PREFIX*: byte = 0
   ETH1_ADDRESS_WITHDRAWAL_PREFIX*: byte = 1
 
diff --git a/beacon_chain/spec/presets/mainnet/altair_preset.nim b/beacon_chain/spec/presets/mainnet/altair_preset.nim
index edb08034b..078454b33 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-rc.2/presets/mainnet/altair.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 328d5b4ca..7e54afa29 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-rc.2/presets/mainnet/bellatrix.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 1b3270848..5342f4f29 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-rc.2/presets/mainnet/phase0.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 86f77d79a..8eb91ee3e 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-rc.2/presets/minimal/altair.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 0d0ee03c0..3737b7e75 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-rc.2/presets/minimal/bellatrix.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/presets/minimal/bellatrix.yaml
 const
   # Updated penalty values
   # ---------------------------------------------------------------
diff --git a/beacon_chain/spec/signatures.nim b/beacon_chain/spec/signatures.nim
index f57017b59..77f9da2d9 100644
--- a/beacon_chain/spec/signatures.nim
+++ b/beacon_chain/spec/signatures.nim
@@ -184,7 +184,7 @@ 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-rc.2/specs/phase0/beacon-chain.md#deposits
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 fdfc76319..b3c8f9358 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-rc.2/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+    # - https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+    # - https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 6075a5bae..3f08bd513 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-rc.2/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#beacon-chain-state-transition-function
 proc advance_slot(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState, previous_slot_state_root: Eth2Digest,
diff --git a/beacon_chain/spec/state_transition_block.nim b/beacon_chain/spec/state_transition_block.nim
index 107b7cfac..b950db271 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-rc.2/specs/phase0/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#block-processing
 #
 # The entry point is `process_block` which is at the bottom of this file.
 #
@@ -31,7 +31,7 @@ import
 
 export extras, phase0, altair
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#block-header
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#block-header
 func process_block_header*(
     state: var ForkyBeaconState, blck: SomeForkyBeaconBlock, flags: UpdateFlags,
     cache: var StateCache): Result[void, cstring] =
@@ -74,7 +74,7 @@ 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-rc.2/specs/phase0/beacon-chain.md#randao
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#randao
 proc process_randao(
     state: var ForkyBeaconState, body: SomeForkyBeaconBlockBody, flags: UpdateFlags,
     cache: var StateCache): Result[void, cstring] =
@@ -107,7 +107,7 @@ proc process_randao(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#eth1-data
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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
@@ -118,14 +118,14 @@ 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-rc.2/specs/phase0/beacon-chain.md#is_slashable_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#proposer-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#proposer-slashings
 proc check_proposer_slashing*(
     state: ForkyBeaconState, proposer_slashing: SomeProposerSlashing,
     flags: UpdateFlags):
@@ -174,7 +174,7 @@ proc check_proposer_slashing*(
   withState(state):
     check_proposer_slashing(state.data, proposer_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#proposer-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#proposer-slashings
 proc process_proposer_slashing*(
     cfg: RuntimeConfig, state: var ForkyBeaconState,
     proposer_slashing: SomeProposerSlashing, flags: UpdateFlags,
@@ -184,7 +184,7 @@ proc process_proposer_slashing*(
   ? slash_validator(cfg, state, proposer_index, cache)
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#is_slashable_attestation_data
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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
@@ -196,7 +196,7 @@ 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-rc.2/specs/phase0/beacon-chain.md#attester-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#attester-slashings
 proc check_attester_slashing*(
        state: ForkyBeaconState,
        attester_slashing: SomeAttesterSlashing,
@@ -238,7 +238,7 @@ proc check_attester_slashing*(
   withState(state):
     check_attester_slashing(state.data, attester_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#attester-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#attester-slashings
 proc process_attester_slashing*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -321,7 +321,7 @@ proc process_deposit*(cfg: RuntimeConfig,
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#voluntary-exits
 proc check_voluntary_exit*(
     cfg: RuntimeConfig,
     state: ForkyBeaconState,
@@ -370,7 +370,7 @@ proc check_voluntary_exit*(
   withState(state):
     check_voluntary_exit(cfg, state.data, signed_voluntary_exit, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#voluntary-exits
 proc process_voluntary_exit*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -382,7 +382,7 @@ proc process_voluntary_exit*(
   ? initiate_validator_exit(cfg, state, exited_validator, cache)
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#operations
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#operations
 proc process_operations(cfg: RuntimeConfig,
                         state: var ForkyBeaconState,
                         body: SomeForkyBeaconBlockBody,
@@ -412,7 +412,7 @@ proc process_operations(cfg: RuntimeConfig,
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#sync-committee-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#sync-committee-processing
 func get_participant_reward*(total_active_balance: Gwei): Gwei =
   let
     total_active_increments =
@@ -427,7 +427,7 @@ 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-rc.2/specs/altair/beacon-chain.md#sync-committee-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/beacon-chain.md#sync-committee-processing
 proc process_sync_aggregate*(
     state: var (altair.BeaconState | bellatrix.BeaconState),
     sync_aggregate: SomeSyncAggregate, total_active_balance: Gwei,
@@ -525,7 +525,7 @@ proc process_execution_payload*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 =
@@ -545,7 +545,7 @@ proc process_block*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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/validator.nim b/beacon_chain/spec/validator.nim
index d944ec8af..7605e0729 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-rc.2/specs/phase0/beacon-chain.md#compute_shuffled_index
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#compute_shuffled_index
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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(state.data, epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_active_validator_indices
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_committee_count_per_slot
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#compute_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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(state.data, slot, index, cache)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#get_beacon_committee
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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(state.data, slot, index, cache)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/beacon-chain.md#compute_shuffled_index
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#compute_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_beacon_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/phase0/beacon-chain.md#get_beacon_proposer_index
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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)
diff --git a/beacon_chain/spec/weak_subjectivity.nim b/beacon_chain/spec/weak_subjectivity.nim
index e49fbbb79..d5959aa57 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-rc.2/specs/phase0/weak-subjectivity.md#checking-for-stale-weak-subjectivity-checkpoint
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 b923bf68f..676d8f3a3 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-rc.2/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
 type LightClientUpdatesByRangeResponse = NetRes[seq[altair.LightClientUpdate]]
 proc doRequest(
     e: typedesc[UpdatesByRange],
@@ -165,7 +165,7 @@ proc doRequest(
       inc expectedPeriod
   return response
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
 proc doRequest(
     e: typedesc[FinalityUpdate],
     peer: Peer
@@ -173,7 +173,7 @@ proc doRequest(
     raises: [Defect, IOError].} =
   peer.lightClientFinalityUpdate()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
 proc doRequest(
     e: typedesc[OptimisticUpdate],
     peer: Peer
@@ -387,7 +387,7 @@ func fetchTime(
     jitterDelay = chronos.seconds(self.rng[].rand(jitterSeconds).int64)
   return wallTime + minDelay + jitterDelay
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/light-client.md#light-client-sync-process
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 0a771b289..ab4daca88 100644
--- a/beacon_chain/sync/sync_protocol.nim
+++ b/beacon_chain/sync/sync_protocol.nim
@@ -30,7 +30,7 @@ const
   blockResponseCost = allowedOpsPerSecondCost(100)
   blockByRangeLookupCost = allowedOpsPerSecondCost(20)
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/p2p-interface.md#configuration
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#configuration
   MAX_REQUEST_LIGHT_CLIENT_UPDATES* = 128
   lightClientEmptyResponseCost = allowedOpsPerSecondCost(50)
   lightClientBootstrapLookupCost = allowedOpsPerSecondCost(5)
@@ -544,7 +544,7 @@ 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-rc.2/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
   proc lightClientBootstrap(
       peer: Peer,
       blockRoot: Eth2Digest,
@@ -572,7 +572,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC bootstrap request done", peer, blockRoot
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
   proc lightClientUpdatesByRange(
       peer: Peer,
       startPeriod: SyncCommitteePeriod,
@@ -614,7 +614,7 @@ 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-rc.2/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
   proc lightClientFinalityUpdate(
       peer: Peer,
       response: SingleChunkResponse[altair.LightClientFinalityUpdate])
@@ -640,7 +640,7 @@ p2pProtocol BeaconSync(version = 1,
 
     debug "LC finality update request done", peer
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
   proc lightClientOptimisticUpdate(
       peer: Peer,
       response: SingleChunkResponse[altair.LightClientOptimisticUpdate])
diff --git a/docs/attestation_flow.md b/docs/attestation_flow.md
index d23d8dff8..3e8f8fe09 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-rc.2/specs/phase0/beacon-chain.md#attestations
+  - https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 f77de292f..5c353ed20 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-rc.2/specs/phase0/beacon-chain.md#block-processing
+  https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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 674e5321d..62ea99b47 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-rc.2/tests/core/pyspec/eth2spec/test/helpers/sync_committee.py#L27-L44
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L32-L62
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/light_client.py#L32-L62
 proc get_sync_aggregate(
     cfg: RuntimeConfig,
     forked: ForkedHashedBeaconState,
@@ -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-rc.2/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L23-L60
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L63-L104
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L107-L149
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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-rc.2/tests/core/pyspec/eth2spec/test/altair/unittests/light_client/test_sync_protocol.py#L152-L201
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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/mocking/mock_blocks.nim b/tests/mocking/mock_blocks.nim
index 23d1cd8d7..ddd4546d4 100644
--- a/tests/mocking/mock_blocks.nim
+++ b/tests/mocking/mock_blocks.nim
@@ -16,7 +16,7 @@ import
 # Routines for mocking blocks
 # ---------------------------------------------------------------
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/tests/core/pyspec/eth2spec/test/helpers/block.py#L26-L35
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/block.py#L26-L35
 func apply_randao_reveal(state: ForkyBeaconState, blck: var ForkySignedBeaconBlock) =
   doAssert state.slot <= blck.message.slot
   let
@@ -29,7 +29,7 @@ func apply_randao_reveal(state: ForkyBeaconState, blck: var ForkySignedBeaconBlo
     blck.message.slot.epoch,
     privkey).toValidatorSig()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/tests/core/pyspec/eth2spec/test/helpers/block.py#L38-L54
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/block.py#L38-L54
 func sign_block(state: ForkyBeaconState, blck: var ForkySignedBeaconBlock) =
   let
     proposer_index = blck.message.proposer_index.ValidatorIndex
@@ -43,7 +43,7 @@ func sign_block(state: ForkyBeaconState, blck: var ForkySignedBeaconBlock) =
     blck.root,
     privkey).toValidatorSig()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/tests/core/pyspec/eth2spec/test/helpers/block.py#L75-L104
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/block.py#L75-L104
 proc mockBlock*(
     state: ForkedHashedBeaconState,
     slot: Slot,
@@ -83,7 +83,7 @@ proc mockBlock*(
 
     sign_block(state.data, blck)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/tests/core/pyspec/eth2spec/test/helpers/block.py#L107-L108
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/block.py#L107-L108
 proc mockBlockForNextSlot*(
     state: ForkedHashedBeaconState): ForkedSignedBeaconBlock =
   ## Mock a BeaconBlock for the next slot
diff --git a/tests/spec_block_processing/test_process_deposits.nim b/tests/spec_block_processing/test_process_deposits.nim
index 4180ac45d..19f3f9837 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-rc.2/specs/phase0/beacon-chain.md#deposits
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/beacon-chain.md#deposits
 # ---------------------------------------------------------------
 
 {.used.}
diff --git a/tests/testblockutil.nim b/tests/testblockutil.nim
index d6b61b029..f09333168 100644
--- a/tests/testblockutil.nim
+++ b/tests/testblockutil.nim
@@ -22,7 +22,7 @@ const
   MockPrivKeys* = MockPrivKeysT()
   MockPubKeys* = MockPubKeysT()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/tests/core/pyspec/eth2spec/test/helpers/keys.py
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/tests/core/pyspec/eth2spec/test/helpers/keys.py
 func `[]`*(_: MockPrivKeysT, index: ValidatorIndex): ValidatorPrivKey =
   # 0 is not a valid BLS private key - 1000 helps interop with rust BLS library,
   # lighthouse. EF tests use 1 instead of 1000.