Arcen (; ) is a village in the Dutch province of Limburg. In 2010, it became part of the municipality of Venlo. Previously, it had been part of the municipality of Arcen en Velden and the seat of the
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 0xfd8c0c699ed033665af398243d5a8376bc782eaef3069f0c62e44420cda51ad6. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59086fc3-adf4-4c40-afed-58d45fcccfab.json and https://artists.proofprofile.net/proofs/artist/59086fc3-adf4-4c40-afed-58d45fcccfab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).