Louis Kaufman (May 10, 1905 – February 9, 1994) was an American violinist. He played on the soundtrack of as many as 500 movies and made over 100 musical recordings. He is also credited with reviving
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 0x20c299ef0a8b82bb72e20480c23a3e45e00d040086bf597f17eb67f54b81ddaa. 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/8501b1e5-0e7c-4799-b376-32eef2750173.json and https://artists.proofprofile.net/proofs/artist/8501b1e5-0e7c-4799-b376-32eef2750173.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Musical Masterpiece String Orchestra play: Antonio Vivaldi: Il Cimento Dell'Armonia e Dell'Invenzione, Concerto No 3
Musical Masterpiece String Orchestra play: Antonio Vivaldi: Il Cimento Dell'Armonia e Dell'Invenzione, Concerto No 2
Chausson, Vivaldi & Others: Works with Violin