David Alan Mamet (; born November 30, 1947) is an American playwright, author, and filmmaker. He won a Pulitzer Prize and received Tony nominations for his plays Glengarry Glen Ross (1984) and Speed-t
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 0xf35958c5abbfdf123ac300e11b58eb5c51ef2e7350cf3061bfbef5ce82f4c56e. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8bbc462-091c-4447-98f5-43ac99381d35.json and https://artists.proofprofile.net/proofs/artist/a8bbc462-091c-4447-98f5-43ac99381d35.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).