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 0xc6e2cb09758ca10988cbbc8e140a78d220540c3b97d6f01bbb00cb3d1a4bfe43. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3c03dba-c119-41d7-84b1-9a91c63e85ea.json and https://artists.proofprofile.net/proofs/artist/a3c03dba-c119-41d7-84b1-9a91c63e85ea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lubomír Železný Violin Concerto, Štěpán Lucký Cello Concerto
Stravinsky, Webern, Hindemith, Schönberg: Violin Compositions