Gblin · Seal

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://gblin.digital/api/x402/seal", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "action": "summarise-contract",
    "input_hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
  }),
});
const data = await res.json();

curl -X POST \
  "https://gblin.digital/api/x402/seal" \
  -H "Content-Type: application/json" \
  -d '{"action":"summarise-contract","input_hash":"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"}' \
  -H "X-PAYMENT: <signed x402 payment>"

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