Zachary Chapman (born December 17, 1990), known professionally as Blacc Zacc, is an American rapper from Columbia, South Carolina. He rose to prominence with his single "Make a Sale" (featuring Moneyb
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 0x139122584fe6e1881c56f1290ba53660c1339041859976bbd38072dabf01500b. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b36cf388-5d2b-4c8d-a777-0ceb3027a970.json and https://artists.proofprofile.net/proofs/artist/b36cf388-5d2b-4c8d-a777-0ceb3027a970.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).