Proposer-Builder Separation Compliance Checker

WHAT IT DOES

Proposer-Builder Separation Compliance Checker provides comprehensive compliance verification for Proposer-Builder Separation (PBS) implementations, enabling protocol developers, validators, and infrastructure operators to ensure that PBS systems correctly separate proposer and builder roles. It retrieves on-chain proposer and builder contract bytecode via eth_getCode and fetches verified source code and ABI from block explorer APIs. The tool analyzes builder specification and payload delivery data, validates relay contract bytecode and state, and checks compliance with PBS standards. It runs a suite of compliance checks including proposer contract validation, builder contract validation, relay contract validation, builder registration verification, slot commitment verification, payload validation, and PBS separation enforcement checking. The output includes a compliance status (Compliant, Partial, or Non-Compliant), detected PBS version, a compliance score (0-100), a detailed check matrix showing each compliance check's result, and actionable recommendations for resolving issues—such as invalid proposer or builder contracts, misconfigured relay contracts, missing builder registrations, or invalid payload delivery. This enables PBS implementers, validators, and infrastructure operators to verify that PBS systems are correctly configured and compliant with the separation principle before deployment.

HOW TO USE

Connect your BGWallet to the target EVM chain. Paste the addresses of the proposer contract, builder contract, and relay contract you wish to check. Provide the payload delivery data as a JSON object containing slot, payloadId, blockHash, and timestamp. Optionally supply a GitHub repository URL to pull PBS implementation details and compliance specifications for additional context. The tool fetches the contract bytecode and state, analyzes the PBS configuration, and runs a comprehensive compliance suite. Review the compliance status, PBS version, compliance score, check matrix, and recommendations. Use the results to verify that your PBS system correctly separates proposer and builder roles and complies with PBS standards.

PROPOSER-BUILDER SEPARATION COMPLIANCE VALIDATION AND ANALYSIS ENGINE

The real technical mechanism is the Proposer-Builder Separation compliance validation and analysis engine that combines contract bytecode analysis with PBS specification semantics. The tool first retrieves the proposer, builder, and relay contract bytecode and analyzes the separation logic—identifying key functions such as registerBuilder, commitSlot, deliverPayload, and validateProposer that handle the PBS workflow. It validates that the proposer contract correctly enforces separation by only accepting payloads from registered builders through the relay, and that the builder contract correctly registers with the relay and commits to slot payloads. The relay contract validation ensures that the relay correctly mediates between builders and proposers, validating payloads and enforcing the separation principle. The builder registration check verifies that builders are correctly registered with the relay and that their registrations are valid. The slot commitment validation ensures that builders correctly commit to payloads for specific slots and that proposers can only access payloads for their assigned slots. The payload validation checks that payload delivery follows the PBS specification, including correct payload IDs, block hashes, and timestamps. The compliance score is calculated as a weighted average of the validation results, with each check contributing to the overall score. This approach provides developers with a comprehensive, automated way to verify PBS compliance, catching issues that would otherwise only surface during live operations and ensuring that PBS systems correctly separate proposer and builder roles.

WHAT IT CANNOT SEE

This tool cannot generate a complete PBS compliance check without access to proposer or builder contract bytecode. It is limited by your RPC provider's rate limits for data retrieval, which may delay analysis on congested networks. It cannot determine if PBS separation is correctly enforced without executing the compliance logic—static analysis provides insights but does not replace full runtime verification. The detection relies on the completeness of the ABI and source code verification; unverified contracts or incomplete verification data will produce incomplete or inaccurate results. Detection is based on bytecode pattern matching and may miss indirect or obfuscated compliance issues, such as compliance logic hidden in libraries or via delegate calls. The tool cannot assess runtime behavior or security implications of PBS compliance, such as how the system handles edge cases or adversarial payloads. It may produce false positives for data that appears similar to PBS data but is used for other purposes. The tool does not execute the contract to validate compliance, so it cannot confirm that the separation is correctly enforced in all scenarios. It cannot account for network-specific PBS implementation differences or future upgrades—different networks may have different PBS implementations or relay configurations. PBS compliance mechanics may vary across networks and change over time as standards evolve.

PLEASE NOTE

This tool works exclusively with EVM-compatible chains that support Proposer-Builder Separation. It requires active internet connectivity to access block explorer APIs and RPC endpoints. Some block explorers may require API keys for high-volume bytecode retrieval. The tool is read-only and does not execute any transactions—it only produces compliance assessments. PBS is critical to MEV-Boost and validator infrastructure; always verify compliance results against actual PBS behavior on testnet before mainnet deployment. Different PBS implementations may have different contract architectures, relay configurations, and compliance requirements.