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 0x0ead1add568f45fc5669dd15afe4f3348f455e96f315e0765316eac325e26003. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/649a2798-e6b7-4da3-8983-26787085d89f.json and https://artists.proofprofile.net/proofs/artist/649a2798-e6b7-4da3-8983-26787085d89f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brahms: Sonata for 2 Pianos in F Minor, Op. 34bis & Piano Quintet in F Minor, Op. 34
Schumann: Bilder aus Osten, Op. 66, Andante and Variations, Op. 46 & Piano Quintet, Op. 44
Reger, M.: 6 Pieces, Op. 94 / 6 Burlesken, Op. 58 / Variations and Fugue On A Theme of Beethoven, Op. 86 (Works for Piano Duo) (Duo D'Accord)