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 0x52431805abb2732e1dba525dae0166fdfeef6688c3c4dc0b7d718e4e827ac1d1. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/907d0203-b208-450f-9c1f-c3ffc388db06.json and https://artists.proofprofile.net/proofs/artist/907d0203-b208-450f-9c1f-c3ffc388db06.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Guitar Recital: Gregoriadou, Smaro - Bach, J.S. / Jose, A. / Gregoriadou, S. (Reinventing Guitar! - New Perspectives in Guitar Sound)
El Aleph: 20th & 21st Century Guitar Music