datahaven-xyz/datahaven · error · Error

InvalidSyncCommitteeUpdate

InvalidSyncCommitteeUpdate

Error message

InvalidSyncCommitteeUpdate

What it means

Thrown in `verify_update` when a submitted light-client update carries a `next_sync_committee` whose computed hash-tree root does not match the committee root already stored as `NextSyncCommittee` in the pallet (when attested period == store period and a next committee exists). The Ethereum consensus light-client protocol requires the proposed next sync committee to be identical to the one committed in the attested beacon state; any mismatch means the update is inconsistent with the on-chain store.

Solutions

1. Re-fetch a fresh light-client update directly from a trusted beacon-node endpoint and re-submit it.
2. Verify the relayer is on the correct network (mainnet vs testnet/fork) and that fork version configuration `T::ForkVersions` matches the chain.
3. If the stored NextSyncCommittee is corrupt/stale, wait for a period-boundary update where `update_finalized_period == store_period + 1` to rotate the committee.
4. Confirm the update was built with the same spec (Altair/Capella+) that the pallet's hash-tree-root implementation expects.

Example fix

// before: relayer cached an old update
submit_update(stale_update);
// after: always build the update from current beacon state
let update = beacon_client.get_light_client_update(finalized_slot);
submit_update(update);

let stored_root = api.query.ethereumClient.nextSyncCommittee().root;
let update_root = hash_tree_root(update.next_sync_committee_update.next_sync_committee);
if update_root !== stored_root { throw new Error('next sync committee does not match stored'); }

function isCurrentPeriodUpdate(update, storePeriod) {
  return computePeriod(update.attested_header.slot) === storePeriod;
}

try {
  await api.tx.ethereumClient.submitFinalityUpdate(update).signAndSend(signer);
} catch (e) {
  if (String(e).includes('InvalidSyncCommitteeUpdate')) {
    console.error('Re-fetch update from beacon node; stored next committee mismatch');
  }
}

When it happens

Trigger: Calling the update submission extrinsic (e.g. `submit_finality_update`-style entry that runs `verify_update`) with an update whose `next_sync_committee_update` root differs from `NextSyncCommittee::<T>::get().root` while `update_attested_period == store_period` and a next committee is already stored. Happens with stale, malformed, or fabricated sync-committee payloads.

Common situations: Relayer submitting updates from a different beacon network/fork, updating with data from an older period, corrupted serialization of the sync committee, or mixing bootstrap data from one chain deployment with updates from another.

Understand the failure class

Background: "Must be a positive integer", "Invalid value", "Unsupported": the invalid-argument-value error family, when a library rejects the value you pass — this error's family across 35 libraries.

Related errors

• SyncCommitteeUpdateRequired
• SyncCommitteeParticipantsNotSupermajority
• InvalidAmount
• ZeroFee
• InvalidEthereumAddress

AI-assisted analysis of datahaven-xyz/datahaven@edcb13dbbc (2026-09-13). Data as JSON: /api/errors/863aae68a3549b43. Report an issue: GitHub.

Appendix: source

Thrown at operator/pallets/ethereum-client/src/lib.rs:420

                    update.block_roots_root,
                    &update.block_roots_branch,
                    subtree_index(block_roots_gindex),
                    generalized_index_length(block_roots_gindex),
                    update.finalized_header.state_root
                ),
                Error::<T>::InvalidBlockRootsRootMerkleProof
            );

            // Verify that the `next_sync_committee`, if present, actually is the next sync
            // committee saved in the state of the `attested_header`.
            if let Some(next_sync_committee_update) = &update.next_sync_committee_update {
                let sync_committee_root = next_sync_committee_update
                    .next_sync_committee
                    .hash_tree_root()
                    .map_err(|_| Error::<T>::SyncCommitteeHashTreeRootFailed)?;
                if update_attested_period == store_period && <NextSyncCommittee<T>>::exists() {
                    let next_committee_root = <NextSyncCommittee<T>>::get().root;
                    ensure!(
                        sync_committee_root == next_committee_root,
                        Error::<T>::InvalidSyncCommitteeUpdate
                    );
                }
                let next_sync_committee_gindex = Self::next_sync_committee_gindex_at_slot(
                    update.attested_header.slot,
                    fork_versions,
                );
                ensure!(
                    verify_merkle_branch(
                        sync_committee_root,
                        &next_sync_committee_update.next_sync_committee_branch,
                        subtree_index(next_sync_committee_gindex),
                        generalized_index_length(next_sync_committee_gindex),
                        update.attested_header.state_root
                    ),
                    Error::<T>::InvalidSyncCommitteeMerkleProof
                );

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