Jeroen () is a Dutch male given name originating from the Greek Hieronymus, and is equivalent to the English name Jerome. In the Netherlands, there are around 52,000 people who are named Jeroen, while
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 0x9b2f855283ab84e1e36ba7ce94fb845770942a984d9cb2d6ce4d1f83c1475a02. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23025f5c-1ac5-4f19-adc2-c1168d8a1fcf.json and https://artists.proofprofile.net/proofs/artist/23025f5c-1ac5-4f19-adc2-c1168d8a1fcf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).