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 0x8ac5b7211adb26ecea31c0122213a35575dfd9ee453aa6ed83862a20ac4279e9. Chain 2 (Bitcoin): anchored in block 954032 (2026-06-17T01:59:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b5eebb0-941d-4493-879c-0606e54ad8d5.json and https://artists.proofprofile.net/proofs/artist/3b5eebb0-941d-4493-879c-0606e54ad8d5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Turina: Canto a Sevilla, La procesión del Rocío, Rapsodia sinfónica & Danzas gitanas
The Royal Chapel of Madrid: Sacred Music After the Great Fire of 1734
De Nebra: Esta Dulzura Amable - Sacred cantatas