Franz Wilhelm Ferling (20 September 1796 – 8 December 1874) was a German oboist, composer, and clarinettist. An accomplished musician, he is chiefly remembered today for his 48 études for oboe, op. 31
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 0x144e3c6b6fadf41ea4d20f928bb19c3fdeb2db0f077b18868658d6f1a2d5db47. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e95ef9c1-84a6-48a8-9ff6-9584cfdeed70.json and https://artists.proofprofile.net/proofs/artist/e95ef9c1-84a6-48a8-9ff6-9584cfdeed70.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
48 Études for Oboe Op.31 by Franz Wilhelm Ferling (24 selected pieces)