Bartek (Czech and Slovak feminine: Bartková or Barteková) is a Czech, Polish and Slovak surname, a diminutive of the given names Bartoloměj in Czech, Bartłomiej and Bartosz in Polish, and Bartolomej i
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 0xf6b30624f6c0f5063efe0257ab0e550fe58ce1efdfd19e31f37d24a6e1426f19. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4603b4c5-c8f1-4ca4-a2d6-1b1ce1aa24c9.json and https://artists.proofprofile.net/proofs/artist/4603b4c5-c8f1-4ca4-a2d6-1b1ce1aa24c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).