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Genesis402 Signed Proof Receipt
x402
Genesis402 Signed Proof Receipt is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-02).
Generates a cryptographically signed proof receipt attesting that a specific text, claim, or content hash existed at a given time, anchored to the Genesis402/UnyKorn operator network
Price / call$0.25
Success—
StatusUnknown
How this service works
Signed proof receipt (genesis402-receipt-v1) — Genesis402 / UnyKorn Operator Network
Output
A signed proof receipt (genesis402-receipt-v1) containing a cryptographic attestation from the UnyKorn Operator Network, confirming the existence and content of the submitted text, claim, and/or SHA-256 hash at the time of the call, bound to the provided subject identifier. The receipt serves as a verifiable, tamper-evident record.
Example use cases
Prove authorship of original writing
“I need a signed proof receipt showing that I authored this paragraph: 'The convergence of AI and decentralized identity will redefine trust on the internet.' — subject is my handle 'researcher_dan' and here's the SHA-256 of the full document: 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a8.”
Notarize a contractual claim
“Can you generate a Genesis402 attestation receipt for the claim 'Party A agrees to deliver services by 2025-07-31' with subject 'contract-2025-007' so we have a cryptographically signed record of when this statement was made?”
Timestamp a file hash for compliance
“I need to certify that this file existed today — its SHA-256 is b94d27b9934d3e08a52e52d7da7dabfac484efe04294e576bda5532da9e43c6e — please generate a signed proof receipt with subject 'compliance-audit-Q2-2025' so I can submit it as evidence.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/prove?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-use cryptographic proof-of-existence or attestation receipt without setting up a blockchain wallet or smart contract. It is ideal for agents that need to certify claims, timestamps, or document hashes on behalf of users in compliance, legal, or provenance workflows. Prefer it over general notary services when the x402 micropayment model fits your agent's payment infrastructure and you need a structured machine-readable receipt.
Side effects
- Text exceeds 16,384 character limit — request rejected with validation error
- SHA-256 hash does not match the 64-character hex pattern — schema validation failure
- Claim string exceeds 512 character limit — truncation or rejection
- Subject string exceeds 200 character limit — validation error
- Payment not completed or x402 payment header missing/invalid — 402 Payment Required response
- Operator network unavailable — 503 or timeout with no receipt issued
- Duplicate submission may produce a distinct receipt with a different timestamp, not idempotent
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "prove",
"verify": {
"keys": "/prove/keys",
"source": "https://github.com/FTHTrading/402-truth"
},
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.25,
"receipt_id": "g402-<16hex>"
},
"proofReceipt": {
"issuer": {
"alg": "ed25519",
"keyId": "g402-key-<16hex>"
},
"receiptId": "g402_rcpt_<12hex>",
"truthLabels": [
"ATTESTED",
"VERIFIED"
],
"receiptVersion": "genesis402-receipt-v1"
}
}
}Tags
x402
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