Bengt Olof Lennart Lindqvist (3 June 1936 – 3 December 2016) was a Swedish politician and advocate of persons with disabilities. Born in Helsingborg in 1936, he was a member of the Social Democratic
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 0x112019e702a7a3b2b0d583d4359385d6056aba31226fb0487ae29103058f081b. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0e316c3-5d42-458c-a093-ced14a6c1c4d.json and https://artists.proofprofile.net/proofs/artist/c0e316c3-5d42-458c-a093-ced14a6c1c4d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).