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 0xba30caaa1440bc38fb9f66b1b1a223f5255c5887b47fa4bf37a4176b44932a80. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ec803f7-0f52-4273-bbe2-5a5ae4cb4fd6.json and https://artists.proofprofile.net/proofs/artist/0ec803f7-0f52-4273-bbe2-5a5ae4cb4fd6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven, Smetana, Dvořák: String Quartets
Haydn / Schubert / Ravel: String Quartets
Beethoven: String Quartet in E minor, "Razumovsky" - Mozart: Quintet in A major, "Stadler-Quintet"
Mozart, Smetana & Shostakovich (Wigmore Hall Live)