Ludvigsen is a surname. Notable people with the surname include: Bjarte Ludvigsen (born 1975), a.k.a. Blue, record producer from Bergen, Norway Bjørn Ludvigsen (1969–2025), Norwegian footballer Gunva
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 0x8f8041ab6119411594ec85b76995848dfc4aaa56082abb844fb569d1cc91d028. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05b9ddd7-6a7c-4b5c-8bab-a2408bc0e34d.json and https://artists.proofprofile.net/proofs/artist/05b9ddd7-6a7c-4b5c-8bab-a2408bc0e34d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.