Signed timestamp receipts for a SHA-256 hash. Send only the hash; we never see the document.
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First seen 5 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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Tools
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| stamp_hash | Returns a signed receipt {sha256, stamped_at, key_id, signature, public_key_url}: a booklint-family service saw this hash at stamped_at, signed with key key_id. Send ONLY a SHA-256 hex digest (64 characters). We never see or store the document — only the hash you send. This is not legal proof, notary service, evidence, or a certificate of anything. Not advice. | Changes data |
| verify_receipt | Checks a receipt from stamp_hash against the published public keys (same check as POST /v1/verify; pass the receipt fields as arguments). Returns valid true or false with a reason. valid true means only that this service signed that hash and time with that key. This is not legal proof, notary service, evidence, or a certificate of anything. | Read-only |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | booklint stamp | - | 5 Oct 2026 |