Big Tex is a tall figure and marketing icon of the annual State Fair of Texas held at Fair Park in Dallas, Texas, United States. The figure has become a cultural icon of Dallas and Texas. Since 1952,
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 0xdbfc4a3085c816e5d2c275f3dc752a829b2961529854e94442ccf7cc1e2e4ce5. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b3c9adf-4360-4e39-9c24-a4ef0f82a411.json and https://artists.proofprofile.net/proofs/artist/0b3c9adf-4360-4e39-9c24-a4ef0f82a411.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).