thumb Mack Gray (December 11, 1905 – January 17, 1981) was an American actor who was the brother of Joe Gray (actor) and great-uncle of Jon Abrahams. He was given the nickname "Killer" by Carole Lom
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 0xabd40725b3d5386606e3abe507e44b6d7d85ddcdbb49b7d11d1cde508e216cac. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/efd7b466-0385-40f5-b06d-de491352bc38.json and https://artists.proofprofile.net/proofs/artist/efd7b466-0385-40f5-b06d-de491352bc38.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).