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 0x291535594ffbf0368fdc0cc8b090c482cc23308175ecc40b68c17e800dcb3083. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cc71293-06cd-40f7-a12c-317f08c5147e.json and https://artists.proofprofile.net/proofs/artist/9cc71293-06cd-40f7-a12c-317f08c5147e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Reti, Jozsef: Arias and Sacred Music by Bach, Vivaldi, Mozart, and Liszt