Pierre Culliford (; 25 June 1928 – 24 December 1992) was a Belgian comics writer and artist who worked under the pseudonym Peyo (). His best-known works are the comic book series The Smurfs and Johan
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 0xb0157fca4d9336f4a2bdbf1c0657b0d732d7ee583aa37f9e40796fe86f0489d6. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c27ce792-41a8-4f93-b903-7ac662457dbf.json and https://artists.proofprofile.net/proofs/artist/c27ce792-41a8-4f93-b903-7ac662457dbf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).