Source Appendix

"Decision Receipt fills all four NIST AI RMF gaps: GOVERN via deny-by-default policy enforcement with signed receipt, MAP via evidence bundle capturing full decision-time context, MEASURE via deterministic replay from sealed evidence, MANAGE via portable Ed25519-signed receipt for independent verification."

"No deployed product treats AI decision accountability as an infrastructure layer with a portable, verifiable output artifact. Adjacent tools record THAT a decision occurred or generate new explanations — none produce a sealed, replayable proof."

"A Decision Receipt is a portable, cryptographically signed artifact that captures the complete accountability record for a single AI-assisted decision. Based on the public patent abstract, a receipt contains five layers: evidence bundle, policy enforcement record, competing hypotheses, Ed25519 signature, and deterministic replay capability."

"Ed25519 provides deterministic signatures, 128-bit security, fast verification (~71,000 verifications/second), and 64-byte signatures with 32-byte public keys. Any party with the public key can verify a receipt without contacting the issuing system."

"An audit log records that a decision was made. Post-hoc explainability generates a NEW inference to explain a PAST decision. Deterministic replay seals the evidence bundle at decision time and allows re-execution to produce the same outcome — transforming a record into a proof."