That's it may refer to: That's It!, a 1961 album by American jazz saxophonist Booker Ervin That's It!, a 2013 album by Preservation Hall Jazz Band That's It!, debut studio album by Ricky Skaggs
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be1d48d79f0c1e1bb7b9f8ecdc14b7233993f42c4a2d29b56aff34073829f07. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ee9184af-ab8a-43d0-a128-e9c8a7db72ad.json and https://artists.proofprofile.net/proofs/artist/ee9184af-ab8a-43d0-a128-e9c8a7db72ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).