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 0x0158e861bb50c75feb8c8f85972ff520b3e2fc77491b66aa6e3e8cabad46423b. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bef83585-4b9d-47e0-8972-35c0cac4b045.json and https://artists.proofprofile.net/proofs/artist/bef83585-4b9d-47e0-8972-35c0cac4b045.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Debussy - Suite Bergamasque: III. Clair de Lune
Beethoven: Piano Sonata No. 14 in C sharp minor, Op 27, No. 2. Adagio Sostenuto "Moonlight Sonata"
Beethoven: Bagatelle No. 25 in A Minor. Für Elise
Chopin: Impromptu No.4 in C sharp minor, Op.66 "Fantaisie-Impromptu" - Allegro agitato
Bach: Suite No. 3 in D Major, BWV 1068. Air (on the G String)
Chopin: Piano Sonata No.2 in B flat Minor, Op. 35: III. Marche Funébre - Lento (Funeral March)
Mozart: Piano Sonata No. 11 in A, K.331 'Alla Turca', I, Tema (Andante Grazioso) Con Variazioni
Mozart: Piano Sonata No. 16 in C major , K545, I, Allegro
Bach: Prelude No. 1 in C major (BWV 846) from The Well Tempered Clavier
Bach: Fugue in G Minor, BWV 578, 'Little Fugue'
Tchaikovsky: String Quartet No.1 in D Major, Op. 11, II. Andante Cantabile (Arranged for Solo Piano)
Fugue in G Minor, BWV 578, 'Little Fugue'
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xb4823980ba329e35f61ecfa973b9ce0b1e546edeb08bfe901bf7ce08c7e63242. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA61465019.