Proof of existence for files: anchor a SHA-256 hash on Base, look up proofs. Paid with x402.
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First seen 6 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| anchor_hash | Paid with x402 (USDC on Base). Writes the SHA-256 hash of a file on-chain; the block time becomes the proof of existence. Compute the hash locally and never send the file. The hash, the filename and the payer address become public and permanent. Without a payment in _meta["x402/payment"] the result is the payment requirement. | Changes data |
| find_proof | Free. Look up whether a file hash is anchored on Base and when, or read the proof written by a transaction. Pass `hash` or `tx`. Call it before anchor_hash to avoid paying for a hash that is already anchored. | Read-only |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | Akashi Notari | - | 6 Oct 2026 |