Robert Dennis Chapman (born 18 August 1946), also known as Sammy Chapman, is a footballer who played as a defender in the Football League during the 1960s and 1970s, most notably with Nottingham Fores
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 0xd4661137e9c3d4a24c9f73a200df5303b184fcc29d9849cf928fbb5a24258ab2. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a42de05c-996b-494f-a4db-836460cef3e9.json and https://artists.proofprofile.net/proofs/artist/a42de05c-996b-494f-a4db-836460cef3e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).