VeriDoc verifies document authenticity on Ethereum Sepolia. Send a keccak-256 hash of a file; get back whether that exact document was registered on-chain and when. Privacy-first — the file is never uploaded, only the hash. Use for certificates, contracts, transcripts, or any registered document. POST JSON {"hash":"0x…"}. Speaks x402 — $0.05 USDC/call on Base, no account or API key needed.

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