Evidence Vault API
W3C Verifiable Credentials.
Merkle-tree aggregation of every receipt produced by any Audact API. W3C VC and PDF exports. A public verifier (launching) will let counterparties and regulators validate a single receipt or an entire batch without a vendor account.
Public verifier: verify.audact.ai — (launching) — for regulators and counterparties to validate a receipt without a vendor account.
Sample W3C Verifiable Credential
GET /v1/receipts/{id}?format=vc · Ed25519 signature, did:web issuer
{
"@context": [
"https://www.w3.org/2018/credentials/v1",
"https://audact.ai/credentials/v1"
],
"type": ["VerifiableCredential", "AIInteractionAttestation"],
"issuer": "did:web:audact.ai",
"issuanceDate": "2026-08-15T10:14:23Z",
"credentialSubject": {
"id": "rcpt_01HX7K9M3P4Q5R6S7T8U9V",
"interactionId": "call_8h2k9d7",
"modality": "voice",
"article50Clause": "1",
"merkleRoot": "0x4a7d1ed414...",
"merkleProof": ["0x1b2c3d4e...", "0x5f6a7b8c..."],
"rfc3161Timestamp": "2026-08-15T10:14:23.412Z"
},
"proof": {
"type": "Ed25519Signature2020",
"created": "2026-08-15T10:14:23Z",
"verificationMethod": "did:web:audact.ai#key-1",
"proofPurpose": "assertionMethod",
"proofValue": "z3FXQjecWufY46..."
}
}What you get
Merkle aggregation
Every receipt anchored to a daily root. Tamper-evident, batch-verifiable.
W3C VC + PDF
Same evidence in two formats. Machine-verifiable JSON-LD and human-readable PDF.
Public verifier
Public verifier for regulators and counterparties (verify.audact.ai — launching).
Retention controls
Per-jurisdiction retention windows. 5-year DE default, crypto-shredding on the rest.
Receipts a regulator can verify themselves.
Included in Agency Pro & Enterprise — book a call and we'll scope it with you. Public verifier at verify.audact.ai (launching).