diff --git a/README.md b/README.md
index cdea434fb..6e9b09d4a 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ This [guide](https://nimbus.guide/migration.html) will take you through the basi
 ## Related projects
 
 * [status-im/nimbus-eth1](https://github.com/status-im/nimbus-eth1/): Nimbus for Ethereum 1
-* [ethereum/consensus-specs](https://github.com/ethereum/consensus-specs/tree/v1.3.0-rc.5#stable-specifications): Consensus specification that this project implements
+* [ethereum/consensus-specs](https://github.com/ethereum/consensus-specs/tree/v1.3.0/#stable-specifications): Consensus specification that this project implements
 
 You can check where the beacon chain fits in the Ethereum ecosystem in our Two-Point-Oh series: https://our.status.im/tag/two-point-oh/
 
diff --git a/beacon_chain/spec/presets.nim b/beacon_chain/spec/presets.nim
index a21c92bb4..e4e431ad6 100644
--- a/beacon_chain/spec/presets.nim
+++ b/beacon_chain/spec/presets.nim
@@ -327,7 +327,7 @@ elif const_preset == "minimal":
 
     # Transition
     # ---------------------------------------------------------------
-    # TBD, 2**256-2**10 is a placeholder
+    # 2**256-2**10 for testing minimal network
     TERMINAL_TOTAL_DIFFICULTY:
       u256"115792089237316195423570985008687907853269984665640564039457584007913129638912",
     # By default, don't use these params
diff --git a/beacon_chain/spec/signatures_batch.nim b/beacon_chain/spec/signatures_batch.nim
index 65ed28c70..b5b43805f 100644
--- a/beacon_chain/spec/signatures_batch.nim
+++ b/beacon_chain/spec/signatures_batch.nim
@@ -64,8 +64,8 @@ func aggregateAttesters(
   if validatorIndices.len == 0:
     # 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/v1.3.0-rc.3/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+    # Consensus specs require at least one attesting index in attestation
+    # - https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
     return err("aggregateAttesters: no attesting indices")
 
   let
@@ -90,8 +90,8 @@ func aggregateAttesters(
   if validatorIndices.len == 0:
     # 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/v1.3.0-rc.3/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
+    # Consensus specs require at least one attesting index in attestation
+    # - https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
     return err("aggregateAttesters: no attesting indices")
 
   var attestersAgg{.noinit.}: AggregatePublicKey
diff --git a/beacon_chain/spec/state_transition_block.nim b/beacon_chain/spec/state_transition_block.nim
index f005aab14..20c1ce4dc 100644
--- a/beacon_chain/spec/state_transition_block.nim
+++ b/beacon_chain/spec/state_transition_block.nim
@@ -6,11 +6,11 @@
 # 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/v1.3.0-rc.5/specs/phase0/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/beacon-chain.md#block-processing
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/capella/beacon-chain.md#block-processing
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/deneb/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#block-processing
 #
 # The entry point is `process_block` which is at the bottom of this file.
 #
@@ -38,10 +38,10 @@ from ./datatypes/capella import
 
 export extras, phase0, altair
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#block-header
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#block-header
 func process_block_header*(
-    state: var ForkyBeaconState, blck: SomeForkyBeaconBlock, flags: UpdateFlags,
-    cache: var StateCache): Result[void, cstring] =
+    state: var ForkyBeaconState, blck: SomeForkyBeaconBlock,
+    flags: UpdateFlags, cache: var StateCache): Result[void, cstring] =
   # Verify that the slots match
   if not (blck.slot == state.slot):
     return err("process_block_header: slot mismatch")
@@ -80,10 +80,10 @@ 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/v1.3.0-rc.5/specs/phase0/beacon-chain.md#randao
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#randao
 proc process_randao(
-    state: var ForkyBeaconState, body: SomeForkyBeaconBlockBody, flags: UpdateFlags,
-    cache: var StateCache): Result[void, cstring] =
+    state: var ForkyBeaconState, body: SomeForkyBeaconBlockBody,
+    flags: UpdateFlags, cache: var StateCache): Result[void, cstring] =
   let
     proposer_index = get_beacon_proposer_index(state, cache).valueOr:
       return err("process_randao: proposer index missing, probably along with any active validators")
@@ -113,8 +113,10 @@ proc process_randao(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#eth1-data
-func process_eth1_data(state: var ForkyBeaconState, body: SomeForkyBeaconBlockBody): Result[void, cstring]=
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#eth1-data
+func process_eth1_data(
+    state: var ForkyBeaconState,
+    body: SomeForkyBeaconBlockBody): Result[void, cstring] =
   if not state.eth1_data_votes.add body.eth1_data:
     # Count is reset  in process_final_updates, so this should never happen
     return err("process_eth1_data: no more room for eth1 data")
@@ -124,14 +126,14 @@ func process_eth1_data(state: var ForkyBeaconState, body: SomeForkyBeaconBlockBo
     state.eth1_data = body.eth1_data
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#is_slashable_validator
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#is_slashable_validator
 func is_slashable_validator(validator: Validator, epoch: Epoch): bool =
   # Check if ``validator`` is slashable.
   (not validator.slashed) and
     (validator.activation_epoch <= epoch) and
     (epoch < validator.withdrawable_epoch)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#proposer-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#proposer-slashings
 proc check_proposer_slashing*(
     state: ForkyBeaconState, proposer_slashing: SomeProposerSlashing,
     flags: UpdateFlags):
@@ -175,12 +177,12 @@ proc check_proposer_slashing*(
   ValidatorIndex.init(header_1.proposer_index)
 
 proc check_proposer_slashing*(
-    state: var ForkedHashedBeaconState; proposer_slashing: SomeProposerSlashing;
+    state: var ForkedHashedBeaconState, proposer_slashing: SomeProposerSlashing,
     flags: UpdateFlags): Result[ValidatorIndex, cstring] =
   withState(state):
     check_proposer_slashing(forkyState.data, proposer_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/phase0/beacon-chain.md#proposer-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#proposer-slashings
 proc process_proposer_slashing*(
     cfg: RuntimeConfig, state: var ForkyBeaconState,
     proposer_slashing: SomeProposerSlashing, flags: UpdateFlags,
@@ -190,7 +192,7 @@ proc process_proposer_slashing*(
   ? slash_validator(cfg, state, proposer_index, cache)
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#is_slashable_attestation_data
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#is_slashable_attestation_data
 func is_slashable_attestation_data(
     data_1: AttestationData, data_2: AttestationData): bool =
   ## Check if ``data_1`` and ``data_2`` are slashable according to Casper FFG
@@ -202,7 +204,7 @@ 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/v1.3.0-rc.5/specs/phase0/beacon-chain.md#attester-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#attester-slashings
 proc check_attester_slashing*(
        state: ForkyBeaconState,
        attester_slashing: SomeAttesterSlashing,
@@ -239,12 +241,12 @@ proc check_attester_slashing*(
   ok slashed_indices
 
 proc check_attester_slashing*(
-    state: var ForkedHashedBeaconState; attester_slashing: SomeAttesterSlashing;
+    state: var ForkedHashedBeaconState, attester_slashing: SomeAttesterSlashing,
     flags: UpdateFlags): Result[seq[ValidatorIndex], cstring] =
   withState(state):
     check_attester_slashing(forkyState.data, attester_slashing, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/phase0/beacon-chain.md#attester-slashings
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#attester-slashings
 proc process_attester_slashing*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -331,7 +333,7 @@ proc process_deposit*(cfg: RuntimeConfig,
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#voluntary-exits
 proc check_voluntary_exit*(
     cfg: RuntimeConfig,
     state: ForkyBeaconState,
@@ -374,13 +376,13 @@ proc check_voluntary_exit*(
   ValidatorIndex.init(voluntary_exit.validator_index)
 
 proc check_voluntary_exit*(
-    cfg: RuntimeConfig, state: ForkedHashedBeaconState;
-    signed_voluntary_exit: SomeSignedVoluntaryExit;
+    cfg: RuntimeConfig, state: ForkedHashedBeaconState,
+    signed_voluntary_exit: SomeSignedVoluntaryExit,
     flags: UpdateFlags): Result[ValidatorIndex, cstring] =
   withState(state):
     check_voluntary_exit(cfg, forkyState.data, signed_voluntary_exit, flags)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#voluntary-exits
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#voluntary-exits
 proc process_voluntary_exit*(
     cfg: RuntimeConfig,
     state: var ForkyBeaconState,
@@ -410,8 +412,8 @@ proc process_bls_to_execution_change*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#operations
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.1/specs/capella/beacon-chain.md#modified-process_operations
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#operations
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/capella/beacon-chain.md#modified-process_operations
 proc process_operations(cfg: RuntimeConfig,
                         state: var ForkyBeaconState,
                         body: SomeForkyBeaconBlockBody,
@@ -444,22 +446,24 @@ proc process_operations(cfg: RuntimeConfig,
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/beacon-chain.md#sync-committee-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#sync-aggregate-processing
 func get_participant_reward*(total_active_balance: Gwei): Gwei =
   let
     total_active_increments =
       total_active_balance div EFFECTIVE_BALANCE_INCREMENT
     total_base_rewards =
-      get_base_reward_per_increment(total_active_balance) * total_active_increments
+      get_base_reward_per_increment(total_active_balance) *
+        total_active_increments
     max_participant_rewards =
-      total_base_rewards * SYNC_REWARD_WEIGHT div WEIGHT_DENOMINATOR div SLOTS_PER_EPOCH
+      total_base_rewards * SYNC_REWARD_WEIGHT div
+        WEIGHT_DENOMINATOR div SLOTS_PER_EPOCH
   max_participant_rewards div SYNC_COMMITTEE_SIZE
 
-# https://github.com/ethereum/consensus-specs/blob/v1.1.0-alpha.6/specs/altair/beacon-chain.md#sync-committee-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#sync-aggregate-processing
 func get_proposer_reward*(participant_reward: Gwei): Gwei =
   participant_reward * PROPOSER_WEIGHT div (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/beacon-chain.md#sync-committee-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#sync-aggregate-processing
 proc process_sync_aggregate*(
     state: var (altair.BeaconState | bellatrix.BeaconState |
                 capella.BeaconState | deneb.BeaconState),
@@ -556,12 +560,12 @@ proc process_execution_payload*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/capella/beacon-chain.md#modified-process_execution_payload
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/capella/beacon-chain.md#modified-process_execution_payload
 proc process_execution_payload*(
     state: var capella.BeaconState, payload: capella.ExecutionPayload,
     notify_new_payload: capella.ExecutePayload): Result[void, cstring] =
-  ## Verify consistency of the parent hash with respect to the previous
-  ## execution payload header
+  # Verify consistency of the parent hash with respect to the previous
+  # execution payload header
   if is_merge_transition_complete(state):
     if not (payload.parent_hash ==
         state.latest_execution_payload_header.block_hash):
@@ -599,12 +603,12 @@ proc process_execution_payload*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/deneb/beacon-chain.md#process_execution_payload
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#process_execution_payload
 proc process_execution_payload*(
     state: var deneb.BeaconState, payload: deneb.ExecutionPayload,
     notify_new_payload: deneb.ExecutePayload): Result[void, cstring] =
-  ## Verify consistency of the parent hash with respect to the previous
-  ## execution payload header
+  # Verify consistency of the parent hash with respect to the previous
+  # execution payload header
   if is_merge_transition_complete(state):
     if not (payload.parent_hash ==
         state.latest_execution_payload_header.block_hash):
@@ -643,7 +647,7 @@ proc process_execution_payload*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/capella/beacon-chain.md#new-process_withdrawals
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/capella/beacon-chain.md#new-process_withdrawals
 func process_withdrawals*(
     state: var (capella.BeaconState | deneb.BeaconState),
     payload: capella.ExecutionPayload | deneb.ExecutionPayload):
@@ -685,7 +689,7 @@ func process_withdrawals*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/deneb/beacon-chain.md#tx_peek_blob_versioned_hashes
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#tx_peek_blob_versioned_hashes
 func tx_peek_blob_versioned_hashes(opaque_tx: Transaction):
     Result[seq[VersionedHash], cstring] =
   ## This function retrieves the hashes from the `SignedBlobTransaction` as
@@ -742,7 +746,7 @@ func verify_kzg_commitments_against_transactions*(
 
   all_versioned_hashes == mapIt(kzg_commitments, it.kzg_commitment_to_versioned_hash)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/deneb/beacon-chain.md#blob-kzg-commitments
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#blob-kzg-commitments
 func process_blob_kzg_commitments(
     state: var deneb.BeaconState,
     body: deneb.BeaconBlockBody | deneb.TrustedBeaconBlockBody |
@@ -779,7 +783,7 @@ func is_data_available(
 
   true
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.5/specs/phase0/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#block-processing
 # TODO workaround for https://github.com/nim-lang/Nim/issues/18095
 # copy of datatypes/phase0.nim
 type SomePhase0Block =
@@ -844,7 +848,7 @@ proc process_block*(
   if is_execution_enabled(state, blck.body):
     ? process_execution_payload(
         state, blck.body.execution_payload,
-        func(_: bellatrix.ExecutionPayload): bool = true)
+        func(_: bellatrix.ExecutionPayload): bool = true)  # [New in Bellatrix]
   ? process_randao(state, blck.body, flags, cache)
   ? process_eth1_data(state, blck.body)
 
@@ -859,7 +863,7 @@ proc process_block*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/capella/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/capella/beacon-chain.md#block-processing
 # TODO workaround for https://github.com/nim-lang/Nim/issues/18095
 type SomeCapellaBlock =
   capella.BeaconBlock | capella.SigVerifiedBeaconBlock | capella.TrustedBeaconBlock
@@ -873,10 +877,11 @@ proc process_block*(
 
   ? process_block_header(state, blck, flags, cache)
   if is_execution_enabled(state, blck.body):
-    ? process_withdrawals(state, blck.body.execution_payload)  # [New in Capella]
+    ? process_withdrawals(
+        state, blck.body.execution_payload)  # [New in Capella]
     ? process_execution_payload(
         state, blck.body.execution_payload,
-        func(_: capella.ExecutionPayload): bool = true)
+        func(_: capella.ExecutionPayload): bool = true)  # [Modified in Capella]
   ? process_randao(state, blck.body, flags, cache)
   ? process_eth1_data(state, blck.body)
 
@@ -892,7 +897,7 @@ proc process_block*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.2/specs/eip4844/beacon-chain.md#block-processing
+# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#block-processing
 # TODO workaround for https://github.com/nim-lang/Nim/issues/18095
 type SomeDenebBlock =
   deneb.BeaconBlock | deneb.SigVerifiedBeaconBlock | deneb.TrustedBeaconBlock