Cho or CHO may refer to: People Chief Happiness Officer Chief Heat Officer Surnames Cho (Korean surname), one romanization of the common Korean surname Zhuo (), romanized Cho in Wade–Giles, Ch
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 0xd902ce8aa06529f4ebe4189bf92915eaaea20e4a4c3dc0c5c4443cc0b75e94e4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/750d7142-f0e0-4aea-9369-725bfa9f4922.json and https://artists.proofprofile.net/proofs/artist/750d7142-f0e0-4aea-9369-725bfa9f4922.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).