TGK may refer to: Keratinocyte transglutaminase, an enzyme Chemical oxygen generator Tongkang LRT station (LRT station abbreviation), Sengkang, Singapore
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 0xc2942f77531925fadb113f9581b8d66266ef8b91cc54e18d2745c79718ff0342. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b091b254-919e-41bf-82a8-ae5a7769ece7.json and https://artists.proofprofile.net/proofs/artist/b091b254-919e-41bf-82a8-ae5a7769ece7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).