Arthur Winograd (April 22, 1920 – April 22, 2010) was the music director of the Hartford Symphony Orchestra and the founding cellist of the Juilliard String Quartet.MARGALIT FOX, "Arthur Winograd, Har
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 0x951010e375d499a8916cb6e2797d6135495bf260f921269f4171d2abf25fd94d. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/051c4950-e469-4450-820f-f3ee472f123c.json and https://artists.proofprofile.net/proofs/artist/051c4950-e469-4450-820f-f3ee472f123c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Church Sonatas, Vol. 2 (Mono Version)
Mozart: Church Sonatas, Vol. 1 (Mono Version)