Charles Joseph Clark (born June 5, 1939) is a Canadian businessman, writer, and retired politician who served as the 16th prime minister of Canada from 1979 to 1980. He served as leader of the Officia
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 0x7f8ae9a1c46113df9f323d61edce63c626c3179f2df7fe41006dcf122210fff4. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b13bf5c-b73b-4ceb-8798-23a62c0ac01c.json and https://artists.proofprofile.net/proofs/artist/7b13bf5c-b73b-4ceb-8798-23a62c0ac01c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).