diff --git a/beacon_chain/gossip_processing/gossip_validation.nim b/beacon_chain/gossip_processing/gossip_validation.nim
index 8c5c32743..1ad776a4a 100644
--- a/beacon_chain/gossip_processing/gossip_validation.nim
+++ b/beacon_chain/gossip_processing/gossip_validation.nim
@@ -756,7 +756,7 @@ proc validateAggregate*(
 
   return ok((attesting_indices, sig))
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#attester_slashing
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/p2p-interface.md#attester_slashing
 proc validateAttesterSlashing*(
     pool: ExitPool, attester_slashing: AttesterSlashing):
     Result[void, ValidationError] =
diff --git a/beacon_chain/spec/beacon_time.nim b/beacon_chain/spec/beacon_time.nim
index 18f99a0c1..8fd85301a 100644
--- a/beacon_chain/spec/beacon_time.nim
+++ b/beacon_chain/spec/beacon_time.nim
@@ -137,7 +137,7 @@ const
   # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#attesting
   attestationSlotOffset* = TimeDiff(nanoseconds:
     NANOSECONDS_PER_SLOT.int64 div INTERVALS_PER_SLOT)
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#broadcast-aggregate
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/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.3/specs/altair/validator.md#prepare-sync-committee-message
diff --git a/beacon_chain/spec/datatypes/base.nim b/beacon_chain/spec/datatypes/base.nim
index e2975c2f8..2a2fd1211 100644
--- a/beacon_chain/spec/datatypes/base.nim
+++ b/beacon_chain/spec/datatypes/base.nim
@@ -388,7 +388,7 @@ type
     message*: BeaconBlockHeader
     signature*: TrustedSig
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#aggregateandproof
+  # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#aggregateandproof
   AggregateAndProof* = object
     aggregator_index*: uint64 # `ValidatorIndex` after validation
     aggregate*: Attestation
diff --git a/beacon_chain/spec/eth2_apis/rest_types.nim b/beacon_chain/spec/eth2_apis/rest_types.nim
index 4fe1cec3b..ae78ab81d 100644
--- a/beacon_chain/spec/eth2_apis/rest_types.nim
+++ b/beacon_chain/spec/eth2_apis/rest_types.nim
@@ -376,13 +376,13 @@ type
     DOMAIN_CONTRIBUTION_AND_PROOF*: DomainType
     # PARTICIPATION_FLAG_WEIGHTS
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#constants
     TARGET_AGGREGATORS_PER_COMMITTEE*: uint64
     RANDOM_SUBNETS_PER_VALIDATOR*: uint64
     EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION*: uint64
     ATTESTATION_SUBNET_COUNT*: uint64
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#constants
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/altair/validator.md#constants
     TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE*: uint64
     SYNC_COMMITTEE_SUBNET_COUNT*: uint64
 
diff --git a/beacon_chain/spec/presets.nim b/beacon_chain/spec/presets.nim
index 46bab1d44..44021c238 100644
--- a/beacon_chain/spec/presets.nim
+++ b/beacon_chain/spec/presets.nim
@@ -510,7 +510,7 @@ template name*(cfg: RuntimeConfig): string =
   else:
     const_preset
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#configuration
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/p2p-interface.md#configuration
 func MIN_EPOCHS_FOR_BLOCK_REQUESTS*(cfg: RuntimeConfig): uint64 =
   cfg.MIN_VALIDATOR_WITHDRAWABILITY_DELAY + cfg.CHURN_LIMIT_QUOTIENT div 2
 
diff --git a/beacon_chain/spec/presets/minimal/phase0_preset.nim b/beacon_chain/spec/presets/minimal/phase0_preset.nim
index 40ae32935..af0d66139 100644
--- a/beacon_chain/spec/presets/minimal/phase0_preset.nim
+++ b/beacon_chain/spec/presets/minimal/phase0_preset.nim
@@ -1,5 +1,5 @@
 # Minimal preset - Phase0
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/presets/minimal/phase0.yaml
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/presets/minimal/phase0.yaml
 
 const
   #
@@ -7,11 +7,11 @@ const
   # ---------------------------------------------------------------
   # [customized] Just 4 committees for slot for testing purposes
   MAX_COMMITTEES_PER_SLOT* {.intdefine.}: uint64 = 4
-  # [customized] unsecure, but fast
+  # [customized] insecure, but fast
   TARGET_COMMITTEE_SIZE*: uint64 = 4
   # 2**11 (= 2,048)
   MAX_VALIDATORS_PER_COMMITTEE*: uint64 = 2048
-  # [customized] Faster, but unsecure.
+  # [customized] Faster, but insecure.
   SHUFFLE_ROUND_COUNT*: uint64 = 10
   # 4
   HYSTERESIS_QUOTIENT*: uint64 = 4
diff --git a/beacon_chain/validators/validator_duties.nim b/beacon_chain/validators/validator_duties.nim
index 7bcd10e56..777b6863b 100644
--- a/beacon_chain/validators/validator_duties.nim
+++ b/beacon_chain/validators/validator_duties.nim
@@ -1140,7 +1140,7 @@ proc signAndSendAggregate(
         shufflingRef, slot, committee_index, selectionProof):
       return
 
-    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#construct-aggregate
+    # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#construct-aggregate
     # https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#aggregateandproof
     var
       msg = SignedAggregateAndProof(
@@ -1494,7 +1494,7 @@ 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.3/specs/phase0/validator.md#broadcast-aggregate
   # 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
diff --git a/beacon_chain/validators/validator_pool.nim b/beacon_chain/validators/validator_pool.nim
index 73a870f71..19b13ad2d 100644
--- a/beacon_chain/validators/validator_pool.nim
+++ b/beacon_chain/validators/validator_pool.nim
@@ -301,7 +301,7 @@ proc getAttestationSignature*(v: AttachedValidator, fork: Fork,
       let request = Web3SignerRequest.init(fork, genesis_validators_root, data)
       await v.signData(request)
 
-# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#broadcast-aggregate
+# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.3/specs/phase0/validator.md#broadcast-aggregate
 proc getAggregateAndProofSignature*(v: AttachedValidator,
                                     fork: Fork,
                                     genesis_validators_root: Eth2Digest,
@@ -320,7 +320,7 @@ proc getAggregateAndProofSignature*(v: AttachedValidator,
         fork, genesis_validators_root, aggregate_and_proof)
       await v.signData(request)
 
-# 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
 proc getSyncCommitteeMessage*(v: AttachedValidator,
                               fork: Fork,
                               genesis_validators_root: Eth2Digest,