KD and variants may refer to: Businesses and organizations Transportation KD Avia, a former Russian airline (IATA code KD) KD Transportation Group, a South Korean bus company Kalstar Aviation (IAT
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 0xe0fa5f12c5483139b9c9821359eb8939443a86fe2bf8705c912fda429f95dd8a. Chain 2 (Bitcoin): anchored in block 953991 (2026-06-16T18:47:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ee870d0-0368-4d15-a822-dd8844aea383.json and https://artists.proofprofile.net/proofs/artist/2ee870d0-0368-4d15-a822-dd8844aea383.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).