TK may refer to: People Tarantadong Kalbo (born 1985), Filipino comic strip cartoonist Tony Kanaan (born 1974), Brazilian racing driver Theodore K. Lawless (1892–1971), American dermatologist and
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 0xad825f6f2f80df9b21307aa85e43e7611aed51550371d31a21910aa208fc5326. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62c2e373-8987-4080-b7ef-8efb95cb493e.json and https://artists.proofprofile.net/proofs/artist/62c2e373-8987-4080-b7ef-8efb95cb493e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).