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 0x5f220fb57c21a87e7b004f2e61bcf62dadf0d957ebf8333acb09487d4de77195. Chain 2 (Bitcoin): anchored in block 954729 (2026-06-21T18:16:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb950e52-8b25-4432-a7fa-78b3988e3b06.json and https://artists.proofprofile.net/proofs/artist/fb950e52-8b25-4432-a7fa-78b3988e3b06.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chamber Music (Baroque) - Clarke, J. / Stanley, J. / Handel, G.F. / Byrd, W. / Mouret, J.-J. / Daquin, L.-C.
Baroque Music - Handel, G.F. / Corrette, M. / Lalande, M.-R. De / Cruger, J. (Festive Trumpet Concerto, Vol. 4)