itsu (いつ/itsu is Japanese for when) is a British chain of East Asian-inspired fast food shops and restaurants and a grocery company.Moules, Jonathan. "itsu founder nurtures a new generation" , Financi
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 0xe90c856745795cdd8e392048bbfc45a97d4f83527f54a96c60b3895db9bea738. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa50a60a-62f8-4e3c-acbf-89583451cbe6.json and https://artists.proofprofile.net/proofs/artist/aa50a60a-62f8-4e3c-acbf-89583451cbe6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).