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 0xbf6238c3f3a64bb51694661d5f41806b7d81fa38d7abd7e9405f349016db6061. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9249ba43-a655-436e-9bc3-2933e436d431.json and https://artists.proofprofile.net/proofs/artist/9249ba43-a655-436e-9bc3-2933e436d431.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
24 Preludes and Fugues, Op. 87: Fugue No. 13 in F-Sharp
Chopin: Piano Concerto No. 2 in F Minor, Op. 21: III. Allegro vivace (Arr. for Piano)
Beethoven: Piano Concerto No. 5 in E-Flat Major, Op. 73 "Emperor": II. Adagio un poco mosso (Arr. Nakamura for Solo Piano)
Ravel: Miroirs, M. 43: III. Une barque sur l'océan