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 0xe3e0c4194092376a7acf576460d4873cbef0216368c7e6b1659e3c212ba8c868. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbd516d7-49d7-4084-af00-9b61790d9ff5.json and https://artists.proofprofile.net/proofs/artist/fbd516d7-49d7-4084-af00-9b61790d9ff5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Berg: Piano Sonata, Op. 1 - Batik: Waltz for Patrizia - Brahms: 4 Piano Pieces, Op. 119 - Beethoven: Piano Sonata No. 32, Op. 111