Block Builder Validator

WHAT IT DOES

Block Builder Validator gives Ethereum validators, staking operators, and security researchers a comprehensive tool for validating block builder proposals and ensuring builder integrity. It reads live on-chain data including block builder proposals, validator registrations, builder performance metrics, block payloads, validator slot assignments, and builder reputation data. You can validate block payloads, register validators with builders, report builder misconduct with evidence, and monitor builder status. The tool shows you in real time whether builders are active, how many proposals are pending, whether validators are registered, and the last validation performed—so you can maintain trust in the builder ecosystem and ensure only valid blocks are proposed.

HOW TO USE

Connect your EVM wallet (must be the contract owner or authorized address). Enter the builder contract address, block payload (hex), validator public key, and slot number. Use "Check builder status" to see active status, last block, active proposals, validator registration, and last validated slot. Click "Validate block" to submit a block payload for validation at a specific slot. Use "Register validator" to register a validator with the builder system. "Report misconduct" allows you to submit evidence of builder misbehavior. "Query proposals" shows current active proposals. Each action generates a transaction you review and sign in your wallet.

TECHNICAL APPROACH

This tool interacts with block builder validation contracts using ethers v5.7.2. It calls validateBlock(), registerValidator(), reportMisconduct(), getBuilderStatus(), getActiveProposals(), isValidatorRegistered(), and getLastValidated() on the builder contract to manage and query validation state. The tool validates block payloads by submitting them with slot numbers for verification. For misconduct reporting, it submits evidence data along with the builder address. It checks builder status by reading active state and last block number from the contract. All RPC calls are wrapped in a robust error handler that extracts the actual failure reason from Ethers error objects, digging three levels deep to avoid showing "[object Object]" when a transaction reverts. Transaction costing uses receipt.effectiveGasPrice post-EIP-1559 rather than tx.gasPrice, which overstates actual spend.

WHAT IT CANNOT SEE

This tool cannot verify off-chain builder reputation or detect all forms of builder misbehavior. It cannot guarantee that validated blocks will be accepted by the network. It cannot simulate block proposals or predict which builders will be honest. It cannot see builder internal decision-making or validation criteria. It cannot detect whether a builder is manipulating block contents in subtle ways. It cannot guarantee that reported misconduct will result in penalties. The tool provides validation and reporting capabilities, but it does not guarantee that builders will act honestly or that validated blocks will be included in the canonical chain.

PLEASE NOTE

This tool supports EVM‑compatible chains only (Ethereum, Goerli, Sepolia, Arbitrum, Optimism, Polygon). Block builder validation is primarily used on Ethereum Mainnet and testnets. Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. This is a read‑write tool that requires signing transactions—always verify the builder contract address, payload, slot, and evidence before approving. No contract addresses are hardcoded; you paste the contracts you are managing. The tool is free and open under the BotGentz PLAYBOOK‑C specification.