Andrew Wilson Appel (born 1960) is the Eugene Higgins Professor of computer science at Princeton University. He is especially well known because of his compiler books, the Modern Compiler Implementati
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e38b707eb12d5ef474d876e28706a3e44c6f874b8f27c9b53569fbc2fa059e. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db6bf672-180e-42ea-bb0f-146029d2b0b8.json and https://artists.proofprofile.net/proofs/artist/db6bf672-180e-42ea-bb0f-146029d2b0b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Couperin: Deuxième livre de pièces de clavecin, Ordre 6