David Meier (26 June 1891 – 21 April 1986) was a politician from Liechtenstein who served as mayor of Mauren from 1933 to 1948. He worked as a farmer. He was a member of the Mauren municipal council
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 0x210626eac8aa9b2a1913036fddc9a4f55e38c94ef1e9220e216c0d642e3d9ccd. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3323b8f4-b149-4e4e-a980-12b2a2127798.json and https://artists.proofprofile.net/proofs/artist/3323b8f4-b149-4e4e-a980-12b2a2127798.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.