is a Vocaloid by Internet Co., Ltd. Her voice is sampled by Megumi Nakajima. The mascot of the software is called (stylized as GUMI). She is also sometimes called Megpoid GUMI, or GUMI Megpoid. The
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 0x8f004943bef4571920877b077b4ca4fc6740be9ee73fbc894778d9d8e9468d85. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b71d865-6ee6-4475-9ed5-f02c303725f2.json and https://artists.proofprofile.net/proofs/artist/1b71d865-6ee6-4475-9ed5-f02c303725f2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
不思議ちゃんとミラクルハッピー
やりたかったこと、できなかったこと。