Doron Sheffer (; born 12 March 1972) is an Israeli former professional basketball player. He spent most of his club career playing with Maccabi Tel Aviv. During his playing career he played at the poi
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 0x16b25d3a4e3baeb3c487f4c0c94be09d4eaa43e9def1b7d9469707f5929fc5af. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44ad5f0a-6413-4eba-97be-e6881f1f413a.json and https://artists.proofprofile.net/proofs/artist/44ad5f0a-6413-4eba-97be-e6881f1f413a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).