James Sampson may refer to: James Sampson (physician) (1789–1861), Irish-born physician and politician in Upper Canada Jum Sampson (c. 1876–?), Australian rugby player
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 0x688be6cfc369375c3b65084489e1b3c73802c61c3f7a022508a43b6a3a9bb130. Chain 2 (Bitcoin): anchored in block 953978 (2026-06-16T17:11:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c00c09c-d839-4343-b46f-f907cfe3265e.json and https://artists.proofprofile.net/proofs/artist/2c00c09c-d839-4343-b46f-f907cfe3265e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).