GENYOUINE — verified video testimonials

Certificate checker

Paste a certificate or a link — this page detects which. The check runs in your browser, on your device. Change a single character and the signature fails; that strictness is the point.

AlgorithmEd25519

RunsOn your device

KeysPublished

Certificate or linkdetected: certificate

{
  "version": 1,
  "alg": "Ed25519",
  "payload": {
    "videoHash": "f2bff5cfb54447a773a987231f15e185ebb4d905b64235c7d10a3647fec50b75",
    "sourceHash": "e66aa774f70a8bcceedea31344c2f1639cb0a9b253c4111f80041b1b07788feb",
    "sessionId": "sess_demo_0001",
    "inviteId": "demo",
    "timestamp": "2026-07-03T18:12:04.000Z",
    "keyId": "key-demo-2026"
  },
  "signature": "NM/Q5MMWJ7cSQnFSV8GtA/Tyjbc8zyGohVwB9/Q4xxjFdx/IDtLTCc331EbBdQE9nCuG3bbqz5PbQFwvM6IIDA==",
  "bundleVersion": 2,
  "signatureCovers": [
    "videoHash",
    "sourceHash",
    "timestamp",
    "sessionId",
    "inviteId",
    "keyId"
  ],
  "notCoveredBySignature": [
    "reviewer display name",
    "business name",
    "publication status"
  ],
  "signatureScopeNote": "The certificate signature covers the six signed fields — two fingerprints, the capture timestamp, and the session, invite and key IDs. The transcript, when present, is covered by its own signed attestation (see the transcript verdict). Not covered by any signature: the reviewer's display name, the business name, or any other display data shown alongside it.",
  "transcriptAttestation": {
    "alg": "Ed25519",
    "signature": "OLeT/VXPNzUZ2N3dCFzI6emucerDuqikRW94HXE1aPx+S5ujzAGP0/A4EfY694gRHlJ9hOfQtCRPXNHxHQf8Aw==",
    "payload": {
      "type": "genyouine.transcript-attestation",
      "attestationVersion": 1,
      "certId": "demo",
      "sourceVideoHash": "f2bff5cfb54447a773a987231f15e185ebb4d905b64235c7d10a3647fec50b75",
      "transcriptVersion": 1,
      "language": "en",
      "segments": [
        {
          "segmentId": "demo-seg-0",
          "ordinal": 0,
          "startMs": 0,
          "endMs": 5100,
          "text": "When I first reached out to Northlake, I was overwhelmed and honestly a little skeptical."
        },
        {
          "segmentId": "demo-seg-1",
          "ordinal": 1,
          "startMs": 5100,
          "endMs": 10400,
          "text": "They walked me through everything in plain language and never once talked down to me."
        },
        {
          "segmentId": "demo-seg-2",
          "ordinal": 2,
          "startMs": 10400,
          "endMs": 15800,
          "text": "What stood out was how patient they were when I kept asking the same questions."
        }
      ],
      "transcriptionMethod": {
        "engine": "cloudflare-workers-ai",
        "engineVersion": "@cf/openai/whisper-large-v3-turbo"
      },
      "createdAt": "2026-07-03T18:20:00.000Z",
      "canonicalizationVersion": 1,
      "keyId": "key-demo-attn-2026"
    }
  }
}

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Reference

See the signing keys we’ve ever used, or read the exact byte-level algorithm in docs/CERTIFICATE_SPEC.md.

Signatures are checked against the published signing keys — nothing is sent anywhere.

Ed25519

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On this page

A downloadable file