Max Black (February 24, 1909–August 27, 1988) was a Russian-born British-American philosopher who was a leading figure in analytic philosophy in the years after World War II. He made contributions to
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 0xb6cab49d2cd15d284ef3b86afadebc1b4e5a943cfdbba01046444df8ad246738. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f446d8f4-c08e-434c-8103-616ca5a72a3a.json and https://artists.proofprofile.net/proofs/artist/f446d8f4-c08e-434c-8103-616ca5a72a3a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).