hirofumi maeda
type: MusicGroup
popularity: 2
followers: 8
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x890d6c63bb359212efc40e24f712d2361619af63f6900d6bc6b2188946e9c6eb
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6cffea3f-a0a9-4279-935c-a13e936dd582.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/6cffea3f-a0a9-4279-935c-a13e936dd582.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/6cffea3f-a0a9-4279-935c-a13e936dd582
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x890d6c63bb359212efc40e24f712d2361619af63f6900d6bc6b2188946e9c6eb","name":"hirofumi maeda","registered_at":"2026-06-17T03:39:42Z","symbol":"NIM1269486","token_address":"0x5889d3d7c335c03837bead57d2c155b1a99c5c5e","type":"artist","uuid":"6cffea3f-a0a9-4279-935c-a13e936dd582"}
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 0x890d6c63bb359212efc40e24f712d2361619af63f6900d6bc6b2188946e9c6eb. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6cffea3f-a0a9-4279-935c-a13e936dd582.json and https://artists.proofprofile.net/proofs/artist/6cffea3f-a0a9-4279-935c-a13e936dd582.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x890d6c63bb359212efc40e24f712d2361619af63f6900d6bc6b2188946e9c6eb","name":"hirofumi maeda","registered_at":"2026-06-17T03:39:42Z","symbol":"NIM1269486","token_address":"0x5889d3d7c335c03837bead57d2c155b1a99c5c5e","type":"artist","uuid":"6cffea3f-a0a9-4279-935c-a13e936dd582"}
album: gleam
  type: MusicAlbum
  date published: 2024-06-23
album: beginning
  type: MusicAlbum
  date published: 2024-06-23
album: The Farthest Letters
  type: MusicAlbum
  date published: 2024-06-24
album: Back Ground Music vol.1 【養紡屋】
  type: MusicAlbum
  date published: 2024-07-29
album: Back Ground Music Vol.2【やしき】
  type: MusicAlbum
  date published: 2024-09-28
album: Back Ground Music Vol.3【cafe de clark】
  type: MusicAlbum
  date published: 2025-06-10