GKD may refer to: (Corporate Bodies Authority File) GKD sports cars, a British car manufacturer Glycerol kinase deficiency Gökçeada Airport, in Çanakkale Province, Turkey Klovićevi Dvori Galler
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 0xf59ee1ca690df428665ca86a96b7549f53229f55634fe98a479a9739d02179f1. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb23bbd7-2849-4f74-bb92-e28e10b250c8.json and https://artists.proofprofile.net/proofs/artist/fb23bbd7-2849-4f74-bb92-e28e10b250c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).