大友剛
type: MusicGroup
popularity: 5
followers: 90
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdd513f83cb3e7ec21df538235916813592d2d640690ff4c84c8e2675d2404dea
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/68895620-5a3c-439e-8a5a-1041b07d69a1.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/68895620-5a3c-439e-8a5a-1041b07d69a1.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/68895620-5a3c-439e-8a5a-1041b07d69a1
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdd513f83cb3e7ec21df538235916813592d2d640690ff4c84c8e2675d2404dea","name":"大友剛","registered_at":"2026-06-17T02:00:37Z","symbol":"NIM1245838","token_address":"0x8d80619f1a1a4da2732b5c2d9a3d8641bb6c43d9","type":"artist","uuid":"68895620-5a3c-439e-8a5a-1041b07d69a1"}
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd513f83cb3e7ec21df538235916813592d2d640690ff4c84c8e2675d2404dea. 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/68895620-5a3c-439e-8a5a-1041b07d69a1.json and https://artists.proofprofile.net/proofs/artist/68895620-5a3c-439e-8a5a-1041b07d69a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xdd513f83cb3e7ec21df538235916813592d2d640690ff4c84c8e2675d2404dea","name":"大友剛","registered_at":"2026-06-17T02:00:37Z","symbol":"NIM1245838","token_address":"0x8d80619f1a1a4da2732b5c2d9a3d8641bb6c43d9","type":"artist","uuid":"68895620-5a3c-439e-8a5a-1041b07d69a1"}
album: ～ピアノ・メロディ～こどものうた
  type: MusicAlbum
  date published: 2010
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  type: MusicAlbum
  date published: 2014-06-25
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  type: MusicAlbum
  date published: 2014-07-09
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  type: MusicAlbum
  date published: 2024-02-07