diff --git a/beacon_chain/beacon_chain_db_immutable.nim b/beacon_chain/beacon_chain_db_immutable.nim
index 3edf888d87..e20e01ee66 100644
--- a/beacon_chain/beacon_chain_db_immutable.nim
+++ b/beacon_chain/beacon_chain_db_immutable.nim
@@ -123,7 +123,7 @@ type
     current_sync_committee*: SyncCommittee     # [New in Altair]
     next_sync_committee*: SyncCommittee        # [New in Altair]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/beacon-chain.md#beaconstate
   # Memory-representation-equivalent to a Bellatrix BeaconState for in-place SSZ
   # reading and writing
   BellatrixBeaconStateNoImmutableValidators* = object
diff --git a/beacon_chain/consensus_object_pools/attestation_pool.nim b/beacon_chain/consensus_object_pools/attestation_pool.nim
index 35f8076462..b574de3379 100644
--- a/beacon_chain/consensus_object_pools/attestation_pool.nim
+++ b/beacon_chain/consensus_object_pools/attestation_pool.nim
@@ -536,7 +536,7 @@ proc getAttestationsForBlock*(pool: var AttestationPool,
                               cache: var StateCache): seq[Attestation] =
   ## Retrieve attestations that may be added to a new block at the slot of the
   ## given state
-  ## https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#attestations
+  ## https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#attestations
   let newBlockSlot = state.data.slot.uint64
 
   if newBlockSlot < MIN_ATTESTATION_INCLUSION_DELAY:
diff --git a/beacon_chain/gossip_processing/gossip_validation.nim b/beacon_chain/gossip_processing/gossip_validation.nim
index 1239b7cdf0..8c5c327435 100644
--- a/beacon_chain/gossip_processing/gossip_validation.nim
+++ b/beacon_chain/gossip_processing/gossip_validation.nim
@@ -779,7 +779,7 @@ proc validateAttesterSlashing*(
 
   ok()
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#proposer_slashing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/p2p-interface.md#proposer_slashing
 proc validateProposerSlashing*(
     pool: ExitPool, proposer_slashing: ProposerSlashing):
     Result[void, ValidationError] =
diff --git a/beacon_chain/nimbus_beacon_node.nim b/beacon_chain/nimbus_beacon_node.nim
index 84606c76ac..20a743bbde 100644
--- a/beacon_chain/nimbus_beacon_node.nim
+++ b/beacon_chain/nimbus_beacon_node.nim
@@ -783,7 +783,7 @@ func forkDigests(node: BeaconNode): auto =
     node.dag.forkDigests.bellatrix]
   forkDigestsArray
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#phase-0-attestation-subnet-stability
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#phase-0-attestation-subnet-stability
 proc updateAttestationSubnetHandlers(node: BeaconNode, slot: Slot) =
   if node.gossipState.card == 0:
     # When disconnected, updateGossipState is responsible for all things
diff --git a/beacon_chain/spec/beacon_time.nim b/beacon_chain/spec/beacon_time.nim
index a4eba240a2..f94d3ecf2e 100644
--- a/beacon_chain/spec/beacon_time.nim
+++ b/beacon_chain/spec/beacon_time.nim
@@ -143,7 +143,7 @@ const
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#broadcast-aggregate
   aggregateSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64  * 2 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#prepare-sync-committee-message
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#prepare-sync-committee-message
   syncCommitteeMessageSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64  div INTERVALS_PER_SLOT)
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#broadcast-sync-committee-contribution
diff --git a/beacon_chain/spec/datatypes/altair.nim b/beacon_chain/spec/datatypes/altair.nim
index 9acbdfeb1d..9bca4f051f 100644
--- a/beacon_chain/spec/datatypes/altair.nim
+++ b/beacon_chain/spec/datatypes/altair.nim
@@ -130,13 +130,13 @@ type
     signature*: ValidatorSig
       ## Signature by the validator(s) over the block root of `slot`
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#contributionandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#contributionandproof
   ContributionAndProof* = object
     aggregator_index*: uint64 # `ValidatorIndex` after validation
     contribution*: SyncCommitteeContribution
     selection_proof*: ValidatorSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#signedcontributionandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#signedcontributionandproof
   SignedContributionAndProof* = object
     message*: ContributionAndProof
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/datatypes/base.nim b/beacon_chain/spec/datatypes/base.nim
index 77ad039347..b01bc0914e 100644
--- a/beacon_chain/spec/datatypes/base.nim
+++ b/beacon_chain/spec/datatypes/base.nim
@@ -401,7 +401,7 @@ type
     aggregate*: Attestation
     selection_proof*: ValidatorSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#signedaggregateandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#signedaggregateandproof
   SignedAggregateAndProof* = object
     message*: AggregateAndProof
     signature*: ValidatorSig
diff --git a/beacon_chain/spec/datatypes/bellatrix.nim b/beacon_chain/spec/datatypes/bellatrix.nim
index 3ec0a99f1f..4ce4b858e8 100644
--- a/beacon_chain/spec/datatypes/bellatrix.nim
+++ b/beacon_chain/spec/datatypes/bellatrix.nim
@@ -68,7 +68,7 @@ type
     block_hash*: Eth2Digest # Hash of execution block
     transactions*: List[Transaction, MAX_TRANSACTIONS_PER_PAYLOAD]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/merge/beacon-chain.md#executionpayloadheader
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/beacon-chain.md#executionpayloadheader
   ExecutionPayloadHeader* = object
     parent_hash*: Eth2Digest
     fee_recipient*: ExecutionAddress
@@ -96,7 +96,7 @@ type
     parent_hash*: Eth2Digest
     total_difficulty*: Eth2Digest   # uint256
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#beaconstate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/beacon-chain.md#beaconstate
   BeaconState* = object
     # Versioning
     genesis_time*: uint64
@@ -221,7 +221,7 @@ type
     state_root*: Eth2Digest
     body*: TrustedBeaconBlockBody
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#beaconblockbody
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/beacon-chain.md#beaconblockbody
   BeaconBlockBody* = object
     randao_reveal*: ValidatorSig
     eth1_data*: Eth1Data
diff --git a/beacon_chain/spec/helpers.nim b/beacon_chain/spec/helpers.nim
index 69ef30f56c..2dd2a2e8ad 100644
--- a/beacon_chain/spec/helpers.nim
+++ b/beacon_chain/spec/helpers.nim
@@ -322,7 +322,7 @@ func is_execution_block*(blck: SomeForkyBeaconBlock): bool =
   else:
     false
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#is_merge_transition_block
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/beacon-chain.md#is_merge_transition_block
 func is_merge_transition_block(
     state: bellatrix.BeaconState,
     body: bellatrix.BeaconBlockBody | bellatrix.TrustedBeaconBlockBody |
@@ -331,7 +331,7 @@ func is_merge_transition_block(
   not is_merge_transition_complete(state) and
     body.execution_payload != defaultBellatrixExecutionPayload
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#is_execution_enabled
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/bellatrix/beacon-chain.md#is_execution_enabled
 func is_execution_enabled*(
     state: bellatrix.BeaconState,
     body: bellatrix.BeaconBlockBody | bellatrix.TrustedBeaconBlockBody |
diff --git a/beacon_chain/spec/keystore.nim b/beacon_chain/spec/keystore.nim
index 3a318f1890..c7e60ca9a6 100644
--- a/beacon_chain/spec/keystore.nim
+++ b/beacon_chain/spec/keystore.nim
@@ -1001,7 +1001,7 @@ proc createWallet*(kdfKind: KdfKind,
     crypto: crypto,
     nextAccount: nextAccount.get(0))
 
-# https://github.com/ethereum/consensus-specs/blob/v0.12.2/specs/phase0/deposit-contract.md#withdrawal-credentials
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#bls_withdrawal_prefix
 func makeWithdrawalCredentials*(k: ValidatorPubKey): Eth2Digest =
   var bytes = eth2digest(k.toRaw())
   bytes.data[0] = BLS_WITHDRAWAL_PREFIX.uint8
diff --git a/beacon_chain/spec/network.nim b/beacon_chain/spec/network.nim
index 2d024d8bf1..4b5a72d347 100644
--- a/beacon_chain/spec/network.nim
+++ b/beacon_chain/spec/network.nim
@@ -63,12 +63,12 @@ func getAttesterSlashingsTopic*(forkDigest: ForkDigest): string =
 func getAggregateAndProofsTopic*(forkDigest: ForkDigest): string =
   eth2Prefix(forkDigest) & topicAggregateAndProofsSuffix
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#broadcast-attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#broadcast-attestation
 func compute_subnet_for_attestation*(
     committees_per_slot: uint64, slot: Slot, committee_index: CommitteeIndex):
     SubnetId =
-  # Compute the correct subnet for an attestation for Phase 0.
-  # Note, this mimics expected Phase 1 behavior where attestations will be
+  ## Compute the correct subnet for an attestation for Phase 0.
+  # Note, this mimics expected future behavior where attestations will be
   # mapped to their shard subnet.
   let
     slots_since_epoch_start = slot.since_epoch_start()
@@ -79,7 +79,7 @@ func compute_subnet_for_attestation*(
     (committees_since_epoch_start + committee_index.asUInt64) mod
     ATTESTATION_SUBNET_COUNT)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#broadcast-attestation
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#broadcast-attestation
 func getAttestationTopic*(forkDigest: ForkDigest,
                           subnetId: SubnetId): string =
   ## For subscribing and unsubscribing to/from a subnet.
@@ -181,7 +181,7 @@ func getTargetGossipState*(
     raiseAssert "Unknown target gossip state"
 
 func nearSyncCommitteePeriod*(epoch: Epoch): Option[uint64] =
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#sync-committee-subnet-stability
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#sync-committee-subnet-stability
   if epoch.is_sync_committee_period():
     return some 0'u64
   let epochsBefore =
diff --git a/beacon_chain/spec/signatures.nim b/beacon_chain/spec/signatures.nim
index 624310449a..9e9f9d167d 100644
--- a/beacon_chain/spec/signatures.nim
+++ b/beacon_chain/spec/signatures.nim
@@ -331,7 +331,7 @@ proc get_contribution_and_proof_signature*(
 
   blsSign(privkey, signing_root.data)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#aggregation-selection
 func is_sync_committee_aggregator*(signature: ValidatorSig): bool =
   let
     signatureDigest = eth2digest(signature.blob)
diff --git a/beacon_chain/spec/validator.nim b/beacon_chain/spec/validator.nim
index c20e21274f..a8dac89878 100644
--- a/beacon_chain/spec/validator.nim
+++ b/beacon_chain/spec/validator.nim
@@ -407,7 +407,7 @@ func get_beacon_proposer_index*(state: ForkedHashedBeaconState,
   withState(state):
     get_beacon_proposer_index(forkyState.data, cache, slot)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#aggregation-selection
 func is_aggregator*(committee_len: uint64, slot_signature: ValidatorSig): bool =
   let
     modulo = max(1'u64, committee_len div TARGET_AGGREGATORS_PER_COMMITTEE)
diff --git a/beacon_chain/sync/sync_protocol.nim b/beacon_chain/sync/sync_protocol.nim
index ab4daca887..ccb23c7f7a 100644
--- a/beacon_chain/sync/sync_protocol.nim
+++ b/beacon_chain/sync/sync_protocol.nim
@@ -388,7 +388,7 @@ p2pProtocol BeaconSync(version = 1,
       if blockRef.slot.epoch >= dag.cfg.ALTAIR_FORK_EPOCH:
         # Skipping this block should be fine because the spec says:
         # "Clients MAY limit the number of blocks in the response."
-        # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#beaconblocksbyroot
+        # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/p2p-interface.md#beaconblocksbyroot
         #
         # Also, our response would be indistinguishable from a node
         # that have been synced exactly to the altair transition slot.
diff --git a/beacon_chain/validators/slashing_protection_v2.nim b/beacon_chain/validators/slashing_protection_v2.nim
index bb73e96cef..27b65ebcc8 100644
--- a/beacon_chain/validators/slashing_protection_v2.nim
+++ b/beacon_chain/validators/slashing_protection_v2.nim
@@ -58,7 +58,7 @@ import
 #   2. An attester can get slashed for signing
 #      two attestations that together violate
 #      the Casper FFG slashing conditions.
-# - https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#ffg-vote
+# - https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#ffg-vote
 #   The "source" is the current_justified_epoch
 #   The "target" is the current_epoch
 #
diff --git a/beacon_chain/validators/validator_duties.nim b/beacon_chain/validators/validator_duties.nim
index 9db515399c..698abff032 100644
--- a/beacon_chain/validators/validator_duties.nim
+++ b/beacon_chain/validators/validator_duties.nim
@@ -1152,7 +1152,7 @@ proc signAndSendAggregate(
           return
         res.get()
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#aggregation-selection
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#aggregation-selection
     if not is_aggregator(
         shufflingRef, slot, committee_index, selectionProof):
       return
@@ -1484,7 +1484,7 @@ proc handleValidatorDuties*(node: BeaconNode, lastSlot, slot: Slot) {.async.} =
   updateValidatorMetrics(node) # the important stuff is done, update the vanity numbers
 
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#broadcast-aggregate
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#broadcast-sync-committee-contribution
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#broadcast-sync-committee-contribution
   # Wait 2 / 3 of the slot time to allow messages to propagate, then collect
   # the result in aggregates
   static:
diff --git a/beacon_chain/validators/validator_pool.nim b/beacon_chain/validators/validator_pool.nim
index f626d44f65..67ec098880 100644
--- a/beacon_chain/validators/validator_pool.nim
+++ b/beacon_chain/validators/validator_pool.nim
@@ -340,7 +340,7 @@ proc getSyncCommitteeMessage*(v: AttachedValidator,
       )
     )
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#aggregation-selection
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#aggregation-selection
 proc getSyncCommitteeSelectionProof*(v: AttachedValidator, fork: Fork,
                                      genesis_validators_root: Eth2Digest,
                                      slot: Slot,
diff --git a/tests/consensus_spec/fixtures_utils.nim b/tests/consensus_spec/fixtures_utils.nim
index afe1629bee..e2647c6593 100644
--- a/tests/consensus_spec/fixtures_utils.nim
+++ b/tests/consensus_spec/fixtures_utils.nim
@@ -65,7 +65,7 @@ type
     rewards*: List[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
     penalties*: List[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#eth1block
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#eth1block
   Eth1Block* = object
     timestamp*: uint64
     deposit_root*: Eth2Digest