check correct fork version in LC sync protocol

Tests updated: ethereum/consensus-specs#3284
status-im · Mar 8, 2023 · 467df48 · 467df48
1 parent 90640cc
commit 467df48
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/beacon_chain/spec/light_client_sync.nim b/beacon_chain/spec/light_client_sync.nim
@@ -145,7 +145,8 @@ proc validate_light_client_update*(
     if bit:
       participant_pubkeys.add(sync_committee.pubkeys.data[idx])
   let
-    fork_version = cfg.forkVersionAtEpoch(update.signature_slot.epoch)
+    fork_version_slot = max(update.signature_slot, 1.Slot) - 1
+    fork_version = cfg.forkVersionAtEpoch(fork_version_slot.epoch)
     domain = compute_domain(
       DOMAIN_SYNC_COMMITTEE, fork_version, genesis_validators_root)
     signing_root = compute_signing_root(update.attested_header.beacon, domain)