Mark Cox may refer to: Mark Cox (tennis) (born 1943), British tennis player Mark Cox (poet) (born 1956), American poet Mark Cox (rugby league) (born 1978), English rugby league player Mark Cox (actor
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1a126220df79d8cfe2ff2cd2f9896bbafde14b286376e2259cc2b5bf69d0d7. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19cd1d73-e968-49ed-82c3-6d746043c6c6.json and https://artists.proofprofile.net/proofs/artist/19cd1d73-e968-49ed-82c3-6d746043c6c6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
It's Hard When You've Got Something To Say