Efrem Zimbalist (April 21 [O.S. April 9], 1889 – February 22, 1985) was a Russian and American concert violinist, composer, conductor and director of the Curtis Institute of Music. Early life Efrem Z
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 0x3239efd0c897305c7e9f5b3685483e69f123f35cd7fb0e6de93edfc6bce4227a. Chain 2 (Bitcoin): anchored in block 954556 (2026-06-20T12:14:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af5fd2fb-9561-4fbb-99dc-b5e086ebdd05.json and https://artists.proofprofile.net/proofs/artist/af5fd2fb-9561-4fbb-99dc-b5e086ebdd05.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).