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 0xf2122a92d9dd7cb0296964c0bd7b5580861b36f948bae3eb00a2590991bed634. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c872dadd-4923-42d4-a0a1-f542febe36ef.json and https://artists.proofprofile.net/proofs/artist/c872dadd-4923-42d4-a0a1-f542febe36ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Symphonies Nos. 35, 36 & 41 (Arr J.N. Hummel)
Dimitri Ashkenazy Live at the Klassik Musikfest Mühlviertel
Mozart: Symphonies Nos. 38, 39, 40 (Arr. Hummel)
Klassik Musikfest Mühlviertel: Highlights
Klassik Musik Fest Mühlviertel Highlights
Queen Elisabeth Competition - Piano 1999 (Live)
Geneva Music Competition: 75 Years of Musical Discoveries (Live Recording)
Reinecke: Complete Works for Cello & Piano
Renate Pöllmann: Wia Neich (Gedichte in Salzkammergut-Mundart)
Geneva Competition Piano Laureates - Live recording - Laureates Festival 2015