DRK may refer to: The German Red Cross, or Deutsches Rotes Kreuz Drake Bay Airport (IATA code: DRK), Drake Bay, Costa Rica Dash (cryptocurrency), whose previous name (Darkcoin) had the symbol "DRK" D
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 0x3ffe3716a9f7a2f99070962ec305450073ae3ddd53857aaa2dfbefd9307ffed6. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e485df48-baaf-4aae-8014-3bb1a32bd341.json and https://artists.proofprofile.net/proofs/artist/e485df48-baaf-4aae-8014-3bb1a32bd341.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).