Based Rollup Sequencing Test Harness

WHAT IT DOES

This tool tests based rollup sequencing readiness by analyzing L1-L2 bridge contracts, sequencing events, and transaction batch patterns. It provides a comprehensive assessment of whether a based rollup's sequencing infrastructure is correctly implemented and ready for operation. The tool checks sequencing contract verification, L1 bridge contract verification, sequencer status, block production, batch processing, and L1-L2 synchronization. Results are presented as a detailed sequencing test report with status indicators (active/pending/inactive), block counts, last batch timestamps, and an overall readiness score. This is essential for rollup developers testing sequencing implementations, auditors verifying L1-L2 bridge correctness, and teams ensuring based rollup sequencing readiness.

HOW TO USE

Connect your wallet (read-only, no transaction required) and select the target network. Enter the rollup name, sequencing contract address, L1 bridge contract address, and set the lookback blocks for sequencing analysis. Click "test sequencing" and the tool will verify both contracts, analyze their status and sequencing event data, and generate a comprehensive sequencing report. Results display a summary with active sequencer counts and overall readiness percentage, detailed sequencing cards showing each sequencer's status, block production, last batch, and description, and a table of all sequencing components with their statuses. Use the report to identify sequencing gaps, ensure L1-L2 bridge correctness, and verify based rollup readiness for production.

TECHNICAL MECHANISM

The analyzer uses ethers.js v5.7.2 to perform a multi-stage based rollup sequencing test. First, it calls eth_getCode to verify both the sequencing contract and the L1 bridge contract are deployed and uses block explorer APIs to fetch verification status and source code. The tool then scans historical logs using eth_getLogs across the specified block range to identify sequencing events (e.g., BatchSubmitted, BatchVerified, L1BlockDerived), transaction batch events, and L1-L2 bridge events. It queries the contract state via eth_call to retrieve current sequencer status, block production counts, and bridge synchronization state. The tool analyzes each sequencing component: L1 sequencer (checking if it's actively submitting batches), L2 sequencer (checking if it's deriving from L1), backup sequencers, and validator nodes. It calculates overall readiness based on multiple factors: contract verification status, sequencer activity, batch processing consistency, and bridge synchronization health. Each component is assigned a status: active (fully operational), pending (available but not fully active), or inactive (not ready). Results are compiled into a structured report with detailed component information, status indicators, and an overall readiness score.

WHAT IT CANNOT SEE

This tool cannot actually test sequencing or transaction ordering—it performs analysis and verification only. It is limited by the RPC provider's rate limits and block range availability for historical log queries. It cannot simulate L1-L2 synchronization or state derivation—the tool provides an on-chain view but cannot test the actual sequencing logic. The analysis relies on the accuracy and completeness of contract verification and sequencing event data; incomplete logs or unverified contracts may produce incomplete results. It cannot analyze contracts that are not verified or have opaque sequencing mechanisms where events are not emitted. The tool is limited to the specific sequencing contracts and events that are accessible via RPC. It cannot guarantee that sequencing patterns reflect actual L1 ordering without manual review and cross-verification with L1 block data. The tool does not validate the correctness of the sequencing derivation logic—only that the contracts and events are present.

PLEASE NOTE

This is a read‑only analytics tool—it never submits transactions or triggers sequencing. It is designed for EVM‑compatible chains with based rollup contracts that emit sequencing and bridge events. The sequencing test results are for informational and audit purposes only and should not be considered a comprehensive validation of sequencing correctness. Always manually test sequencing logic through actual batch submissions and L1-L2 synchronization in a staging environment. The tool's status indicators are heuristic and based on the selected lookback period and observed patterns—customize thresholds based on your specific rollup configuration and expected sequencing behavior.