BuildProof

BuildProof checks whether a construction document (contract, supplementary agreement, acceptance act) was signed on-chain, by which wallets, when, and whether a later amendment superseded it.

Send: one or more SHA-256 hashes of the exact file bytes (0x + 64 hex; sha256sum file.pdf), optionally the wallet addresses of the parties you expect as signers.

Get back (seconds): a verdict per hash (ATTESTED, SUPERSEDED, PENDING, REJECTED, NOT_FOUND, NO_MATCHING_SIGNERS), signers with their state, registration and attestation dates, amendment links, and the raw JSON.

Reads BuildProofRegistry 0xF818e4A95BBA02c822bCa8A0CFB50a2Ae4B8eE94 on Base mainnet (source verified on Sourcify). Read-only: the document is never uploaded, nothing is written on-chain. No hash in the request: the call is declined and you are not charged.

Open source (MIT): https://github.com/ttimesai-star/buildproof · verify page: https://ttimesai-star.github.io/buildproof/