File: TaikoL2.sol
150:         if (_l1BlockId > lastSyncedBlock + BLOCK_SYNC_THRESHOLD) {
151:             // Store the L1's state root as a signal to the local signal service to
152:             // allow for multi-hop bridging.
153:             ISignalService(resolve("signal_service", false)).syncChainData(
154:                 ownerChainId,
155:                 LibSignals.STATE_ROOT,
156:                 _l1BlockId,
157:                 _l1StateRoot
158:             );
File: LibVerifying.sol
240:         if (_lastVerifiedBlockId > lastSyncedBlock + _config.blockSyncThreshold) {
241:             signalService.syncChainData(
242:                 _config.chainId, LibSignals.STATE_ROOT, _lastVerifiedBlockId, _stateRoot
243:             );
244:         }
