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 0xae96d34ad67a92c054137eabca66600ea245549a1326a3534c607035f1074c86. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99675f46-2d22-490a-9e17-3ff98df67abc.json and https://artists.proofprofile.net/proofs/artist/99675f46-2d22-490a-9e17-3ff98df67abc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Standards of the Big Band Era (Chapter 1)
Standards of the Big Band Era (Chapter 2)
Creole Rhapsody: The Duke Ellington Suites 1931-1974, Chapter 1
New World A-Comin': The Duke Ellington Suites 1931-1974, Chapter 2
Deep South Suite [The Duke Ellington Suites (1931-1974) Chapter 3]