Rei Sakuma
type: MusicGroup
genre: anime
description: is a Japanese actress, voice actress, singer and narrator from Tokyo, Japan. She is best known in Japan for her voice work as Batako in the long running children's series Soreike! Anpanman. Her most
popularity: 19
followers: 224
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfb21fb44e5dee441069837bb399563259a993682cf0f3bc7dccb4d6d8e6c8923
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953807
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953807
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e6c86dde-0973-4a21-9f71-2623139beb64.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/e6c86dde-0973-4a21-9f71-2623139beb64.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/e6c86dde-0973-4a21-9f71-2623139beb64
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T16:39:18Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xfb21fb44e5dee441069837bb399563259a993682cf0f3bc7dccb4d6d8e6c8923","name":"Rei Sakuma","registered_at":"2026-06-15T04:39:44Z","symbol":"NIM0684791","token_address":"0x7666af2799f8b8431d3d72dc3de7853f7eaa0c9f","type":"artist","uuid":"e6c86dde-0973-4a21-9f71-2623139beb64"}
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 0xfb21fb44e5dee441069837bb399563259a993682cf0f3bc7dccb4d6d8e6c8923. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6c86dde-0973-4a21-9f71-2623139beb64.json and https://artists.proofprofile.net/proofs/artist/e6c86dde-0973-4a21-9f71-2623139beb64.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T16:39:18Z
  text: {"copyright_id":"0xfb21fb44e5dee441069837bb399563259a993682cf0f3bc7dccb4d6d8e6c8923","name":"Rei Sakuma","registered_at":"2026-06-15T04:39:44Z","symbol":"NIM0684791","token_address":"0x7666af2799f8b8431d3d72dc3de7853f7eaa0c9f","type":"artist","uuid":"e6c86dde-0973-4a21-9f71-2623139beb64"}