Eine Quittung im eigenen Browser nachrechnen.

import { createHash } from "node:crypto";
import { readFileSync } from "node:fs";
const r = JSON.parse(readFileSync("sample-receipt.json", "utf8"));
const sha = (s) => createHash("sha256").update(s).digest("hex");
// Canonical form: RFC 8785 (JCS), prefixed `audact-receipt-version:<receipt_format_version>\n` for the authentication code.
const canon = (v) => {
  if (v === null || typeof v !== "object") return JSON.stringify(v) ?? "null";
  if (Array.isArray(v)) return "[" + v.map(canon).join(",") + "]";
  const keys = Object.keys(v).sort();
  return "{" + keys.map((k) => JSON.stringify(k) + ":" + canon(v[k])).join(",") + "}";
};
const e = r.preceding_event;
const evidenceHash = sha(
  [e.event_id, e.call_id, e.sequence, e.event_type, e.timestamp, canon(e.data), e.previous_hash].join("|")
);
const results = [
  ["input_hash",    sha(r.sample_texts.input),  r.receipt.input_hash],
  ["output_hash",   sha(r.sample_texts.output), r.receipt.output_hash],
  ["evidence_hash", evidenceHash,               r.receipt.evidence_hash],
].map(([name, got, want]) => { console.log(`${got === want ? "ok  " : "FAIL"} ${name}`); return [name, got === want]; });
process.exitCode = results.every(([, ok]) => ok) ? 0 : 1;