Joseph Yulyevich Achron, also seen as Akhron (Russian: Иосиф Юльевич Ахрон, Hebrew: יוסף אחרון) (May 1, 1886April 29, 1943) was a Russian composer and violinist, who settled in the United States. His
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 0x6309f03414160437d27135976c205c1198692cee965f56aea3d19dae7dd1f245. 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/21def4dd-a433-4fcf-96d4-26a5e5b384c4.json and https://artists.proofprofile.net/proofs/artist/21def4dd-a433-4fcf-96d4-26a5e5b384c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).