GBLIN AI Action Receipt Sealer

x402

GBLIN AI Action Receipt Sealer is a paid API for AI agents from gblin.digital, paid per call via x402, $0.0045/call, status unknown (last checked 2026-10-28).

Seals SHA-256 hashes of an AI action's input and output into a signed, append-only transparency log, returning a portable Ed25519 receipt with RFC 6962 inclusion proof and a blockchain-anchored checkpoint.

Price / call$0.0045

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StatusUnknown

How this service works

Call after your agent completes an action it may later have to prove: seal the hashes of its input and output (only your action label and meta are published) into GBLIN's signed append-only transparency log and get a portable receipt: Ed25519 signature, RFC 6962 inclusion proof, C2SP signed checkpoint; root anchored daily on Base (EAS). Proves existence and time, not correctness. Free reads and demo: gblin-mcp.gblin-mcp-worker.workers.dev/log

Output

A portable cryptographic receipt containing an Ed25519 signature over the sealed hashes, an RFC 6962 Merkle inclusion proof placing the entry in the append-only transparency log, a C2SP signed checkpoint, and a reference to the daily root anchor recorded on Base via EAS. The action label, agent_id, tool, and meta fields are publicly published in the log.

Example use cases

Audit trail for autonomous research agent

“My research agent just finished summarizing a legal document — seal a transparency receipt with action label 'legal-summary', input hash 0xabc1230000000000000000000000000000000000000000000000000000000001, output hash 0xdef4560000000000000000000000000000000000000000000000000000000002, and agent_id 'legal-bot-v2'.”

Timestamping an AI content moderation decision

“I need a tamper-evident record that my content moderation model flagged a post right now — seal the action labeled 'content-moderation', with input hash 0x1111111111111111111111111111111111111111111111111111111111111111 and output hash 0x2222222222222222222222222222222222222222222222222222222222222222, tool is 'moderation-model-v3'.”

Proving AI code generation occurred pre-deployment

“Before I ship this AI-generated code, seal a signed receipt proving the code existed at this moment — action is 'code-generation', input hash 0xaaaa000000000000000000000000000000000000000000000000000000000001, output hash 0xbbbb000000000000000000000000000000000000000000000000000000000002, agent_id 'ci-agent', meta '{"repo":"my-project","pr":42}'.”

Technical details

Endpoint

POSThttps://gblin.digital/api/x402/seal?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a lightweight, cryptographically verifiable, tamper-evident record that a specific AI action occurred at a point in time — without needing a full compliance certificate. Ideal for agents that must prove provenance of outputs, create audit trails, or demonstrate that an input/output pair existed before a given timestamp. Prefer this over generic logging when you want a portable, offline-verifiable receipt anchored to a public blockchain.

Side effects

Invalid hash format (not 64 hex chars) returns validation error
input_hash missing returns 400-level error
Payment not included or insufficient USDC returns 402 Payment Required
Log service unavailable returns 503
meta field exceeds 512 chars returns rejection
action label exceeds 128 chars returns rejection

Input

Schema · Request body

Field	Type	Description
meta	string	Extra JSON object as a string (optional). PUBLISHED.
tool	string	Tool or model used (optional). PUBLISHED.
action	string	Short public label for what the AI did. PUBLISHED in the log: identifiers only, never secrets.
agent_id	string	Your agent identifier (optional). PUBLISHED.
input_hash	string	sha256 of your input, 64 hex chars (0x prefix optional)
output_hash	string	sha256 of your output, 64 hex chars (optional)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "leaf": "<base64 sha256(0x00 || canonical)>",
    "root": "<base64 Merkle root>",
    "index": 42,
    "format": "gblin-receipt/v1",
    "verify": "offline: see verify-receipt.mjs in github.com/gblinproject/gblin-treasury-risk-regime (zero deps)",
    "payload": {
      "v": 1,
      "ts": "2026-08-30T09:00:00.000Z",
      "log": "gblin.digital/receipts-log",
      "index": 42,
      "action": "summarise-contract",
      "input_hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
      "output_hash": null
    },
    "signature": "<base64 Ed25519 over the canonical record>",
    "tree_size": 43,
    "checkpoint": "<C2SP signed note>",
    "verifier_key": "gblin.digital/receipts-log+00c6e18c+...",
    "inclusion_proof": [
      "<base64 node>",
      "<base64 node>"
    ]
  }
}

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