is a Japanese voice actress, lyricist, composer, and singer from Kyoto. Biography Koiwai was born in Kyoto on February 15, 1990. She initially took interest in voice acting after hearing the voice
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 0x2848c768af8fbbcaff299f12aa5c4e12dac4ddbf88dc0b1b62fa0c4d9312d87d. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78d60466-54ee-478d-a1bc-f136b7e21771.json and https://artists.proofprofile.net/proofs/artist/78d60466-54ee-478d-a1bc-f136b7e21771.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).