Arntzen is a surname. Notable people with the surname include: Andrea Arntzen (1875–1958), Norwegian nursing teacher Andreas Arntzen (1777–1837), Norwegian politician Andreas Arntzen (barrister) (192
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 0xf322859c87a78d6718f3d336ea4aa79e4389543f42d0a94f7550701e4032a1dd. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4dcdc3f-24c6-4646-a702-84fb6c6d13be.json and https://artists.proofprofile.net/proofs/artist/e4dcdc3f-24c6-4646-a702-84fb6c6d13be.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).