{"record":{"id":"aab6c4bcbf263a5c","repo":"datahaven-xyz/datahaven","slug":"invalidsynccommitteemerkleproof","errorCode":"InvalidSyncCommitteeMerkleProof","errorMessage":"InvalidSyncCommitteeMerkleProof","messagePattern":"InvalidSyncCommitteeMerkleProof","errorType":"error_code","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"operator/pallets/ethereum-client/src/lib.rs","lineNumber":264,"sourceCode":"\n    impl<T: Config> Pallet<T> {\n        /// Forces a finalized beacon header checkpoint update. The current sync committee,\n        /// with a header attesting to the current sync committee, should be provided.\n        /// An `block_roots` proof should also be provided. This is used for ancestry proofs\n        /// for execution header updates.\n        pub(crate) fn process_checkpoint_update(update: &CheckpointUpdate) -> DispatchResult {\n            let sync_committee_root = update\n                .current_sync_committee\n                .hash_tree_root()\n                .map_err(|_| Error::<T>::SyncCommitteeHashTreeRootFailed)?;\n\n            let fork_versions = T::ForkVersions::get();\n            let sync_committee_gindex = Self::current_sync_committee_gindex_at_slot(\n                update.header.slot,\n                fork_versions.clone(),\n            );\n            // Verifies the sync committee in the Beacon state.\n            ensure!(\n                verify_merkle_branch(\n                    sync_committee_root,\n                    &update.current_sync_committee_branch,\n                    subtree_index(sync_committee_gindex),\n                    generalized_index_length(sync_committee_gindex),\n                    update.header.state_root\n                ),\n                Error::<T>::InvalidSyncCommitteeMerkleProof\n            );\n\n            let header_root: H256 = update\n                .header\n                .hash_tree_root()\n                .map_err(|_| Error::<T>::HeaderHashTreeRootFailed)?;\n\n            // This is used for ancestry proofs in ExecutionHeader updates. This verifies the\n            // BeaconState: the beacon state root is the tree root; the `block_roots` hash is the\n            // tree leaf.","sourceCodeStart":246,"sourceCodeEnd":282,"githubUrl":"https://github.com/datahaven-xyz/datahaven/blob/edcb13dbbcd3c29489eaa2480a6f60ee4cb1f3ec/operator/pallets/ethereum-client/src/lib.rs#L246-L282","documentation":"The Merkle proof in `update.current_sync_committee_branch` fails to prove that the current sync committee root is part of the beacon state at `update.header.state_root`. `process_checkpoint_update` computes the sync committee's generalized index (fork-version dependent) and runs `verify_merkle_branch`; a mismatch between the leaf, branch, or state root raises this error. It means the update's header and sync committee data are inconsistent or the proof was built incorrectly.","triggerScenarios":"Submitting an `Update` via `submit` where `current_sync_committee_branch` does not verify against `update.header.state_root` using the sync-committee generalized index for the header's fork version (wrong branch length/order, wrong leaf, or state_root from a different slot).","commonSituations":"Relayer built the proof with the wrong fork spec (e.g. Altair vs Deneb gindex), submitted an update whose header belongs to a different chain/fork, truncated or reordered the branch, or relayed a stale committee with a newer header.","solutions":["Regenerate `current_sync_committee_branch` from a consensus client using the correct `current_sync_committee` generalized index for the fork active at `update.header.slot`.","Verify `update.header.state_root` matches the header you are proving against (same slot, same chain).","Confirm the fork-version mapping in `T::ForkVersions` includes the fork at the header slot and returns the right gindex.","Check that the update was fetched from the intended beacon chain (correct network/genesis fork digest)."],"exampleFix":"// before\n let branch = proof_for_slot(header.slot, GeneralizedIndex::CURRENT_SYNC_COMMITTEE_LEGACY);\n// after\n let gindex = current_sync_committee_gindex_at_slot(header.slot, &fork_versions);\n let branch = consensus_client.get_merkle_branch(gindex, header.slot);","handlingStrategy":"validation","validationCode":"const ok = verifyMerkleBranch(syncCommitteeRoot, update.currentSyncCommitteeBranch, subtreeIndex(gindex), generalizedIndexLength(gindex), update.header.stateRoot);\nif (!ok) throw new Error('sync committee proof invalid');","typeGuard":null,"tryCatchPattern":"try { await submit(update); } catch (e) { if (e.includes('InvalidSyncCommitteeMerkleProof')) { refetchUpdate(); } else throw e; }","preventionTips":["Build proofs from the same beacon state snapshot as the header","Track fork-version gindex changes","Validate proofs client-side before extrinsic submission"],"tags":["substrate","merkle-proof","beacon-consensus","ssz"],"backgroundTag":"checksum-mismatch","analyzedSha":"edcb13dbbcd3c29489eaa2480a6f60ee4cb1f3ec","analyzedAt":"2026-09-13T19:19:32.206Z","contentChangedAt":"2026-09-13T19:19:32.206Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}