thumb|Horenstein in 1956 Jascha Horenstein (; – 2 April 1973) was an American conductor. Biography Horenstein was born in Kiev, Russian Empire (now Kyiv, Ukraine), into a wealthy Jewish family. He w
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 0xab812cacd9ebb63589eb83849374439833fca469fd7c224ad571c92abd9763ce. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af70763e-c9b1-4ee1-84d4-00e44eee18d9.json and https://artists.proofprofile.net/proofs/artist/af70763e-c9b1-4ee1-84d4-00e44eee18d9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Symphony No. 9 in D Minor, Op. 125 "Choral"
Mozart: Messe, K. 317 "Du couronnement" & Vesperae solennes de confessore, K. 339 (Mono Version)
Strauss: Don Juan - Brahms: Symphony No. 2
Jascha Horenstein: Broadcast Performances from Paris, 1952-1966