David Finckel (born December 6, 1951) is an American cellist and influential figure in the classical music world. The cellist for the Emerson String Quartet from 1979 to 2013, Finckel is currently the
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 0x4dd79a8f345b65178c49a42d104b2802a75e0067858842a0cd5b52cf5636db4a. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2587985e-edd4-42ac-b855-e56196f17b71.json and https://artists.proofprofile.net/proofs/artist/2587985e-edd4-42ac-b855-e56196f17b71.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Music@Menlo Live, Haydn Connections, Vol. 8