Issue an x402 offer-receipt (EIP-712) plus an Tersign compliance record for a settled payment; counter-signs into the ledger when configured.

Verify an offer-receipt artifact (EIP-712) and optionally enforce an expected signer (payTo authorization).

One-call disclosure evidence (EU AI Act Art 50 dialect): digests the disclosure text LOCALLY, signs an action record with your key, and the public ledger counter-signs it into your per-signer hash chain. No API key needed — first call self-provisions a free signer-keyed account.

Verify an Tersign compliance record + attestation (digest binding and signature).

Record a refund against a receipt digest in the Tersign ledger (requires ledger configuration).

Open an objective dispute against a counter-signed receipt as the PAYER (the configured key must be the receipt payer). Reasons: not_delivered, wrong_content, duplicate_charge. Contested non-mechanical claims escalate to the arbiter; duplicate_charge is decided instantly from ledger arithmetic.

Submit signed evidence to an open dispute. Claimant evidence must be signed by the payer key; respondent evidence additionally requires the seller API key (TERSIGN_LEDGER_API_KEY).

Trigger deterministic adjudication of an open dispute (public — the v0 rulebook is recomputable by anyone). Refund verdicts create refund records automatically.

Fetch a dispute record with its evidence, verdict, rationale, and ledger signature.