{"schema":{"tx_id":"Algorand transaction id of the payment being attested","resource_url":"the x402 endpoint that was paid","outcome":"delivered | failed | partial","http_status":"(optional) status the buyer received","note":"(optional, <=200 chars)","reporter":"Algorand address that SENT the payment","signature":"base64 ed25519 signature by `reporter` over the canonical payload","canonical_payload":"tx_id|resource_url|outcome  (utf-8, exactly that order, pipe-separated)"},"submit":"POST /report","cost":"free","why":"delivery truth without continuous paid probing — evidence is bound to real settlements"}