TC, T.C., Tc, Tc, tc, tC, or .tc may refer to: Arts and entertainment Film and television Theodore "T.C." Calvin, a character on the TV series Magnum, P.I. and its reboot Tom Caron, American telev
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 0xb128d54515f959f2490450960a570f47489b79fda24e6721638bc6edc6a5b5b0. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81f8d671-a28e-4b6c-b008-7213ddab0e8e.json and https://artists.proofprofile.net/proofs/artist/81f8d671-a28e-4b6c-b008-7213ddab0e8e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).