T1, T01, T.1 or T-1 may refer to: Places Target One, a Mesoamerican archaeological site in Honduras Tour T1, an office skyscraper in La Défense, Paris, France T1 Mall of Tallinn, shopping and ente
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 0xcb5f0108a0ca88f836609111d725b11a5096e941cf3c30e7e366388ac850df36. Chain 2 (Bitcoin): anchored in block 953982 (2026-06-16T17:42:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d258ed2-6007-4b7e-a555-406aff943cc6.json and https://artists.proofprofile.net/proofs/artist/2d258ed2-6007-4b7e-a555-406aff943cc6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).