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 0x1018a6bddcec6940505c950dc26fda4c079a14a47cdb79b022f0591a7dc830b2. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca7e91d8-bbb6-4c82-8a24-8dfd7b1aa698.json and https://artists.proofprofile.net/proofs/artist/ca7e91d8-bbb6-4c82-8a24-8dfd7b1aa698.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
El Órgano Histórico Español, Vol. 5 (La Escuela de Zaragoza II)
Flores de Música: Iberische Orgelmusik aus Renaissance und Barock