Kasane Teto (, ) is a virtual singer with a voicebank for UTAU, a singing voice synthesizer software. The character was initially created as a joke for April Fools' Day 2008 on the Japanese textboard
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 0x5fa85538a11235d2f75049e3a63acf9619e3cfcc22fa2c08c3e374dc45a4c34b. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3945ed0d-f27b-4023-8983-871ac2f4d5b2.json and https://artists.proofprofile.net/proofs/artist/3945ed0d-f27b-4023-8983-871ac2f4d5b2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).