Thomas Fritzsch (born 1961) is a German viol player and musicologist who has appeared internationally. He has been instrumental in reviving rediscovered music, such as Telemann's 12 Fantasias for Viol
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 0x76eceab6ec084c1b5b8a62d276130ff8e3e586e95a8d9b2b76d48ca77a4f396b. Chain 2 (Bitcoin): anchored in block 954588 (2026-06-20T19:15:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba1570e6-9e78-41bc-8665-f44584bb373b.json and https://artists.proofprofile.net/proofs/artist/ba1570e6-9e78-41bc-8665-f44584bb373b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Johann Christian Bach, Carl Friedrich Abel: Sonatas for Viola da Gamba
Gamba Concertos (The Viola da Gamba in the Spotlight)
The 19th Century Viol da Gamba (Welterbe-Klang World Heritage Sound)
Mozart & Fiala: Musik für Gambe (Music for Viola da Gamba)