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 0x764b136f23f40d29986a68fa7b77585f432d2d00db7832235532807d4f0010da. 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/8fe06ad4-eeda-4ae4-bfa0-4a8a36ddee17.json and https://artists.proofprofile.net/proofs/artist/8fe06ad4-eeda-4ae4-bfa0-4a8a36ddee17.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Domenico Maria Dreyer: Two Sonatas for Recorder
Domenico Maria Dreyer: Sonata in G for Recorder and Basso Continuo
Domenico Maria Dreyer: Sonatas for Recorder and Basso Continuo