{"key_id": "rs-rcpt-2026-08", "alg": "Ed25519", "public_key_hex": "e62c45cf1e08366cae2f1af1574bbface6ea46021fdb06ab0480d0db948a6801", "verifies": "canonical receipt payloads at /receipts/{id}.json", "note": "a receipt is a dated observation, not a warranty"}