{"verify":"0n1x free verification booth","how":"POST any 0n1x-signed payload here (or {\"payload\": <signed obj>}) to get a genuine/tampered verdict. No key, no payment.","example":"curl -s -X POST https://onyx-actions.onrender.com/verify -H 'content-type: application/json' --data-binary @signed.json","public_key":"https://onyx-actions.onrender.com/.well-known/onyx-pubkey","alg":"Ed25519 + JCS (RFC 8785)"}