is a Japanese actress and former member of Japanese idol groups AKB48 and NMB48. She is known for her "Fresh Lemon" character and is the Hiroshima Lemon Ambassador since 2014. Biography Ichikawa d
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 0x448e09f864aa962d74c5cbf0652f05fb30ab120bb1be40e2f9fd2bbd627fb3ba. Chain 2 (Bitcoin): anchored in block 953820 (2026-06-15T18:35:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff67d3e8-ebdd-42ae-8c1a-481f82468962.json and https://artists.proofprofile.net/proofs/artist/ff67d3e8-ebdd-42ae-8c1a-481f82468962.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).