Ceui (, born January 31) is a Japanese singer–songwriter originally from Chiba, Japan, though she grew up in Fukuoka. Ceui's name is derived from the Portuguese word for sky, céu. She has been singing
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 0x925463978f9ced55509f3ec5e8f86871d68a4eca34df72489ca41654c3e6da19. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ead0adf2-d2bc-451c-9655-0734f8271f85.json and https://artists.proofprofile.net/proofs/artist/ead0adf2-d2bc-451c-9655-0734f8271f85.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).