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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf922ad9f8ce780c3aba6d65cb56c88f42f80d1495ed1a93f367ae87b6ef949ae. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f25449b3-c3d1-4e9e-a5fb-25c99380c812.json and https://artists.proofprofile.net/proofs/artist/f25449b3-c3d1-4e9e-a5fb-25c99380c812.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Roger Wolfe Kahn and His Orchestra (1920’s Dance Jazz Band) [Recorded 1927 - 1929] [Encore 3]
Roger Wolfe Kahn and His Orchestra (1920’s Dance Jazz Band) [Recorded 1925 - 1927] [Encore 2]
Roger Wolfe Kahn and His Orchestra (1920’s Dance Jazz Band) [Recorded 1929 - 1932] [Encore 4]
Roger Wolfe Kahn and His Orchestra Encore 1