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 0x2bb922b1671480de5425ffebf4b2ba647c7fa96f4d86580ca24191343f737e80. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f49a531d-ffe6-4ee8-a5db-82db392c1aac.json and https://artists.proofprofile.net/proofs/artist/f49a531d-ffe6-4ee8-a5db-82db392c1aac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
À La Carte - Hungarian Contemporary Works for Cello Solo
Rozsa / Hollos / Kurtag / Vajda / Ligeti / Eotvos / Toth, P. / Tihanyi: Works for Cello Solo
Haydn / Albrechtsberger, J.G. / Albrechtsberger, A.: Duets and Trios for Strings