David Zobel (born 11 June 1996) is a German biathlete. He made his Biathlon World Cup debut in 2021 in Östersund. Career For most of the seasons from 2017 to 2021, Zobel ran in the IBU Cup, the 2nd
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 0x5fdb8cd4473c448441f9fa9d3491661ccf05eb96871395df031972513faee722. Chain 2 (Bitcoin): anchored in block 953882 (2026-06-16T03:13:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09b0aa15-40a3-49bb-83b2-e2bf0a111ef2.json and https://artists.proofprofile.net/proofs/artist/09b0aa15-40a3-49bb-83b2-e2bf0a111ef2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).