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 0xb0ac040786207fd7d783a6182e3d946512b419a9370638c26f70db3327e12892. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b493e972-b068-485c-9d9e-801a507fdec8.json and https://artists.proofprofile.net/proofs/artist/b493e972-b068-485c-9d9e-801a507fdec8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Music for Two Pianos - Milhaud; Rachmaninov; Poulenc; Lutoslawski
Brahms: Sonata for 2 Pianos; Saint-Saëns: Variations for Two Pianos on a Theme of Beethoven
Bartók: Sonata for Two Pianos & Percussion; Poulenc: Sonata for Two Pianos
Brahms: Hungarian Dances Nos. 1-10; Dvorák: Slavonic Dances, Op. 46
Eden & Tamir - Complete Decca Recordings
French Music for Two Pianos; Poulenc; Debussy; Satie