Cầm
type: MusicGroup
genre: v-pop
popularity: 3
followers: 20
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xab9a34607a979182dcfddf33185d77d2fc794f39ee34829dfd0a081fac52a0c5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953909
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953909
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/04b48ef6-90e0-4d86-b078-cb238b9cfd80.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/04b48ef6-90e0-4d86-b078-cb238b9cfd80.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/04b48ef6-90e0-4d86-b078-cb238b9cfd80
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T07:53:13Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xab9a34607a979182dcfddf33185d77d2fc794f39ee34829dfd0a081fac52a0c5","name":"Cầm","registered_at":"2026-06-15T15:10:05Z","symbol":"NIM0746930","token_address":"0x88529f717b5637366c6f15311f2def14eaace507","type":"artist","uuid":"04b48ef6-90e0-4d86-b078-cb238b9cfd80"}
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 0xab9a34607a979182dcfddf33185d77d2fc794f39ee34829dfd0a081fac52a0c5. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04b48ef6-90e0-4d86-b078-cb238b9cfd80.json and https://artists.proofprofile.net/proofs/artist/04b48ef6-90e0-4d86-b078-cb238b9cfd80.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T07:53:13Z
  text: {"copyright_id":"0xab9a34607a979182dcfddf33185d77d2fc794f39ee34829dfd0a081fac52a0c5","name":"Cầm","registered_at":"2026-06-15T15:10:05Z","symbol":"NIM0746930","token_address":"0x88529f717b5637366c6f15311f2def14eaace507","type":"artist","uuid":"04b48ef6-90e0-4d86-b078-cb238b9cfd80"}
album: Mình Từng Có
  type: MusicAlbum
  date published: 2021-08-04
album: Chỉ Muốn Nói
  type: MusicAlbum
  date published: 2021-08-10
album: Ngỏ Lời
  type: MusicAlbum
  date published: 2021-08-13
album: Đừng Buồn Đã Có Anh
  type: MusicAlbum
  date published: 2021-08-27
album: Thành Phố Không Em
  type: MusicAlbum
  date published: 2021-11-09