Megpoid
type: MusicGroup
description: 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
popularity: 7
followers: 96
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb807e9b56ad784ea2b5d5725c429e9e60d9e5428fad1153b4ca9ac60f360cbee
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953970
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953970
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/29c5e514-2a5f-4c83-a1de-4c1595222371.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/29c5e514-2a5f-4c83-a1de-4c1595222371.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/29c5e514-2a5f-4c83-a1de-4c1595222371
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T16:09:39Z
additional property: OTSCanonicalRecord
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb807e9b56ad784ea2b5d5725c429e9e60d9e5428fad1153b4ca9ac60f360cbee. Chain 2 (Bitcoin): anchored in block 953970 (2026-06-16T16:09:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29c5e514-2a5f-4c83-a1de-4c1595222371.json and https://artists.proofprofile.net/proofs/artist/29c5e514-2a5f-4c83-a1de-4c1595222371.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T16:09:39Z