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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaaf473bee64185aac8bc06556bd52f3cc159f4bcd27abb6570c5f204977376f. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03f41a63-a8e2-45bf-ac07-4ea5e557418a.json and https://artists.proofprofile.net/proofs/artist/03f41a63-a8e2-45bf-ac07-4ea5e557418a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Sonata in B Minor, Op. 6: II. Andantino – Allegretto, un poco vivace
Six Pieces for Violin & Piano: III. Lento (Arr. for Violin & Harp by Esther Abrami)