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 0x9a4868829c8adaa50eccdc056307fed8ac87aef6558c257e6e9497673efeef89. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/038aa7b7-009f-4df7-84ce-8c10e1594e3d.json and https://artists.proofprofile.net/proofs/artist/038aa7b7-009f-4df7-84ce-8c10e1594e3d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
E.T.A. Hoffmann Die Abenteuer der Sylvester-Nacht
Der Vampir (Der Vampyr oder Cyprians Erzählung. Eine Schauergeschichte)
E.T.A. Hoffmann: Mass in D Minor; Canzoni per 4 voci alla Capella
Hoffman: Complete Sonatas for Fortepiano
Hoffmann, E.T.A.: Harp Quintet in C Minor / Piano Sonatas in A Major and F Minor / Piano Trio in E Major
Lebensansichten des Katers Murr: (nebst fragmentarischer Biographie des Kapellmeisters Johannes Kreisler in zufälligen Makulaturblättern.)
Ritter Gluck (Eine Erinnerung aus dem Jahre 1809)
The Classic Collection of E.T.A. Hoffmann (The Nutcracker and the Mouse King, The Golden Pot)
Klein Zaches, genannt Zinnober: (Ein Märchen)
Casse-Noisette et le Roi des souris - Livre Audio