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 0x9a979d2f99d99b6e18705ee2326caa5e615fb4c23e9b9b8a0591304a23a70097. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ee80c6b-018e-4c50-9807-fd9e06c7acb4.json and https://artists.proofprofile.net/proofs/artist/3ee80c6b-018e-4c50-9807-fd9e06c7acb4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": II. Andante
Tchaikovsky: Children's Album, Op. 39: No. 21, Sweet Dreams
Grieg: Lyric Pieces Book 1, Op. 12: No. 1, Arietta
Schumann: Album für die Jugend, Op. 68: No. 16, Erster Verlust
J.S. Bach: Prelude & Fugue In C Major (Well-Tempered Clavier, Book I, No. 1), BWV 846: 1. Prelude
Tchaikovsky: Children's Album, Op. 39, TH 141: 16. Old French song
Schumann: Album für die Jugend, Op. 68: No. 14, Kleine Studie
Beethoven: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
Mozart: Piano Sonata No. 11 in A Major, K. 331: 1. Theme (Andante grazioso)
Chopin: Songs, Op. 74: No. 2: Wiosna, B.116
Schubert: 34 Valses sentimentales, Op. 50, D.779: No. 13 A
Mendelssohn: Lieder ohne Worte, Op. 30: 3. Adagio non troppo