thumb|Edward H. Tarr in Hamburg (1996) Edward Hankins Tarr (June 15, 1936 – March 24, 2020), was an American trumpet player and musicologist. He was a pioneer in the revival of Baroque and Romantic er
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 0x002dbff6a0fc74b3619c602b3b5c150423fb6dd336b8d7c1144b8c0826c9dbfd. Chain 2 (Bitcoin): anchored in block 954032 (2026-06-17T01:59:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b7f8dd9-04c9-42af-b367-d39d010374aa.json and https://artists.proofprofile.net/proofs/artist/3b7f8dd9-04c9-42af-b367-d39d010374aa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Haydn, Hummel & Others: Trumpet Concertos