Jos Jansen (born 8 January 1954) is a Belgian rallycross driver. He formerly competed in the FIA World Rallycross Championship. Results FIA World Rallycross Championship Supercar thumb|right|Jansen
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 0x39df2238760d5c9662d586c9ae3c8def1b595a3fd097b4be1073e9a717cd37b4. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10f3749b-a4bf-4b36-8749-40fdadd4d2de.json and https://artists.proofprofile.net/proofs/artist/10f3749b-a4bf-4b36-8749-40fdadd4d2de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).