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 0x23081c560e00dc70824fabb1df9c20f2679771db90c49fa2728a979617233f1b. 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/874b4556-150e-4793-9daa-d44e80337d9d.json and https://artists.proofprofile.net/proofs/artist/874b4556-150e-4793-9daa-d44e80337d9d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brahms - Symphony No. 3 in F Major, Op. 90
J. S. Bach - Orchestral Suite No. 3 in D Major, BWV 1068
Beethoven - Symphony No. 5 in C Minor, Op. 67
Beethoven - Symphony No. 7 in A Major, Op. 92
Schubert - Symphony N° 9 "La Grande" in C Major, D. 944
Beethoven - Symphony No. 3 in E-flat Major "Eroica", Op. 55
Beethoven - Symphony No. 6 "Pastorale" in F Major, Op. 68
Mozart - Sonatas Vol. 2 / A-Major KV 331 & a-minor KV 310
Mozart - Piano Sonatas Vol. 1 C-Major KV 330 - c-minor KV 457
Beethoven - Piano Sonata No. 32 in C Minor, op. 111 - Vol. 1
Beethoven - Symphony No. 9 in D Minor, Op. 125 "Ode to Joy"
Beethoven - Symphony No. 8 in F Major, Op. 93
J.S. Bach: The Well-Tempered Clavier Book 1 - BWV 846-893
Beethoven: Symphony No. 7 in A Major, Op. 92 - The Early Recordings
Richard Wagner: Twilight of the Gods, WWV 86D: Siegfried's Funeral March
Richard Wagner: The Valkyrie, WWV 86B: The Ride of the Valkyries
Symphony "Metropolis" - Ordo ab Chao, Op. 1