John Blake may refer to: Arts and entertainment John Blake Jr. (1947–2014), American jazz violinist John Blake (journalist) (born 1948), British journalist and publisher John Blake (make-up artist),
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 0x0ec104b9cd9e84a0031c765bf10149246bdd57a46bd341009cd2e0c30154beeb. Chain 2 (Bitcoin): anchored in block 953980 (2026-06-16T17:16:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c5b4649-af53-4889-9b97-7392f43ba3c1.json and https://artists.proofprofile.net/proofs/artist/2c5b4649-af53-4889-9b97-7392f43ba3c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).