{"key_id":"synoi-v1","scheme":"hybrid Ed25519 + ML-DSA-65 (FIPS 204), enforced for receipts recorded on/after 2026-06-27 (K1)","ed25519":{"public_key":"-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VwAyEAaCiQr4C0tw4X9iGJEnaXqS3poDPlbG1t03gCfcsTMrg=\n-----END PUBLIC KEY-----\n","algorithm":"Ed25519","encoding":"PEM/SPKI","note":"Use any standard Ed25519 library. Classical signature."},"ml_dsa":{"public_key":"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","algorithm":"ML-DSA-65","standard":"NIST FIPS 204","encoding":"base64 raw public-key bytes (1952 bytes decoded)","note":"Use FIPS 204 ML-DSA-65 / \"Dilithium-3\". Post-quantum signature."},"note":"Hybrid: BOTH signatures must verify. Receipts recorded before K1 (2026-06-27) may carry only Ed25519 and verify classically; receipts recorded on/after K1 MUST be hybrid — an Ed25519-only receipt dated on/after K1 is rejected as a downgrade."}