Mitchell Cohen is an author, essayist and critic. He is professor of political science at Baruch College of the City University of New York and the CUNY Graduate Center. From 1991 to 2009, he was co-e
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 0x5651ec50cb2c19cb9b814202fe9ee90060c68bb3c1bebb7828c8ae3d3cf944c3. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df512b84-0eea-4a79-8c3a-a183ca399efa.json and https://artists.proofprofile.net/proofs/artist/df512b84-0eea-4a79-8c3a-a183ca399efa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).