is a Vocaloid voicebank developed and distributed by Yamaha Corporation for Vocaloid 4. He is voiced by , the lead singer of the Japanese band Sekai no Owari. Development On August 4, 2015, it was a
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 0xde1f5265cdc22b634f53f8754e153720fa7c4a4aea70638007095c6bd43b5cae. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75961bbe-2c2d-478f-8b7e-8c380af99bc7.json and https://artists.proofprofile.net/proofs/artist/75961bbe-2c2d-478f-8b7e-8c380af99bc7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).