LEN
type: MusicGroup
popularity: 4
followers: 63
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x74a24cfe253760650f5abe63365019bad6d9a1597eacbe5b473052c0c04ede88
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954516
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954516
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9ff8a5d1-1af8-40c0-9a8c-9011d1ffb87a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9ff8a5d1-1af8-40c0-9a8c-9011d1ffb87a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9ff8a5d1-1af8-40c0-9a8c-9011d1ffb87a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T07:04:44Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a24cfe253760650f5abe63365019bad6d9a1597eacbe5b473052c0c04ede88. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ff8a5d1-1af8-40c0-9a8c-9011d1ffb87a.json and https://artists.proofprofile.net/proofs/artist/9ff8a5d1-1af8-40c0-9a8c-9011d1ffb87a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T07:04:44Z
album: 未知
  type: MusicAlbum
  date published: 2020-04-01
album: 未知
  type: MusicAlbum
  date published: 2020-04-01
album: 未知
  type: MusicAlbum
  date published: 2020-04-01
album: 未知
  type: MusicAlbum
  date published: 2020-04-01
album: One&Only
  type: MusicAlbum
  date published: 2022-01-26
album: One&Only
  type: MusicAlbum
  date published: 2022-01-26
album: 君の世界
  type: MusicAlbum
  date published: 2023-05-10
album: the world you are in
  type: MusicAlbum
  date published: 2023-05-10
album: Memory (Ⅲ)
  type: MusicAlbum
  date published: 2024-08-07
album: BOKURANOIRO
  type: MusicAlbum
  date published: 2025-04-09
album: 僕らの色
  type: MusicAlbum
  date published: 2025-04-09