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 0xff0662b625ad1aa528663f6c03499f5342679f765fd9a1bb6125b5e0caa5063a. 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/3b6daaed-ed73-48af-afaa-3579733b719a.json and https://artists.proofprofile.net/proofs/artist/3b6daaed-ed73-48af-afaa-3579733b719a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Haydn: Symphony No. 26 'Lamentatione' in D minor, Hob.I:26
Vivaldi: Concerto for 2 Violins and Strings in B Flat major, RV 524
Haydn: Symphony No. 22 'Philosopher' in E Flat major, Hob.I:22
Vivaldi: Mandolin Concerto in C Major RV 425
Haydn: Symphony No. 6 'Le Matin' in D major, Hob.I:6