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 0x2f97ba44a4fdeb0dbdd9c8ac06930f578ead31c31d50240da80863850e549e92. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d37e082f-1655-4d72-a23f-67a2d18e4e70.json and https://artists.proofprofile.net/proofs/artist/d37e082f-1655-4d72-a23f-67a2d18e4e70.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Giambattista Martini, Georg Philipp Telemann, Tomaso Albinoni, Giovanni Buonaventura Viviani, Benedetto Marcello & Johann Wilhelm Hertel: Barockmusik Für Trompete Und Orgel
Trompetenkonzerte (Antonio Vivaldi, Tomaso Albinoni, Heinrich Stölzel, Guiseppe Tartini, Georg Philipp Telemann, Leopold Mozart)