21 NOS
type: MusicGroup
popularity: 11
followers: 452
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7aff194014c084d1ad2130154c693d4db93363fd2a998bde6e1a062d224bafb3
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953733
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953733
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/97520512-e29a-4916-a1b5-9c6d41b2001b.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/97520512-e29a-4916-a1b5-9c6d41b2001b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/97520512-e29a-4916-a1b5-9c6d41b2001b
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T03:12:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7aff194014c084d1ad2130154c693d4db93363fd2a998bde6e1a062d224bafb3","name":"21 NOS","registered_at":"2026-06-14T20:17:18Z","symbol":"NIM0564829","token_address":"0x544c0f4d56e9eadaf424fe6a4f4109f661520ed0","type":"artist","uuid":"97520512-e29a-4916-a1b5-9c6d41b2001b"}
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 0x7aff194014c084d1ad2130154c693d4db93363fd2a998bde6e1a062d224bafb3. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97520512-e29a-4916-a1b5-9c6d41b2001b.json and https://artists.proofprofile.net/proofs/artist/97520512-e29a-4916-a1b5-9c6d41b2001b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-15T03:12:39Z
  text: {"copyright_id":"0x7aff194014c084d1ad2130154c693d4db93363fd2a998bde6e1a062d224bafb3","name":"21 NOS","registered_at":"2026-06-14T20:17:18Z","symbol":"NIM0564829","token_address":"0x544c0f4d56e9eadaf424fe6a4f4109f661520ed0","type":"artist","uuid":"97520512-e29a-4916-a1b5-9c6d41b2001b"}
album: KHÔNG ĐỂ PHÍ
  type: MusicAlbum
  date published: 2023-02-04
  track: KHÔNG ĐỂ PHÍ
    type: MusicRecording
    duration: PT3M15S
    duration ms: 195073
    explicit: false
    by artist: 21 NOS
    in album: KHÔNG ĐỂ PHÍ
      type: MusicAlbum
      date published: 2023-02-04
    isrc code: VNA2E2310296
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-11T11:28:30+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x613f031d9143c124fa901d2c327b071cf3e463424cab5eb1c5e94b8ff707a7da
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 957558
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/957558
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA2E2310296
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-11T11:36:38Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x613f031d9143c124fa901d2c327b071cf3e463424cab5eb1c5e94b8ff707a7da. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA2E2310296 — a six-check JSON result.
      date published: 2026-07-11T11:36:38Z
    audio: KHÔNG ĐỂ PHÍ
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 139.953
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.821
      additional property: Energy
        type: PropertyValue
        value: 0.53
      additional property: Speechiness
        type: PropertyValue
        value: 0.135
      additional property: Acousticness
        type: PropertyValue
        value: 0.381
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.306
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.563
      additional property: Loudness (dB)
        type: PropertyValue
        value: -14.02
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: TRAP
  type: MusicAlbum
  date published: 2024-06-08
album: TLGR
  type: MusicAlbum
  date published: 2024-06-18
album: SONG LO
  type: MusicAlbum
  date published: 2024-07-02
album: N
  type: MusicAlbum
  date published: 2024-12-29
  track: UNFORGIVING
    type: MusicRecording
    duration: PT2M53S
    duration ms: 173684
    explicit: true
    by artist: 21 NOS
    in album: N
      type: MusicAlbum
      date published: 2024-12-29
    isrc code: VNA2F2403228
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-03T21:31:39+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x6a51f34d34da94e3e9257fcee30a78f7cc3cfb5ee86bc46132fe91c2295341fe
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956634
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956634
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA2F2403228
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-04T10:04:33Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x6a51f34d34da94e3e9257fcee30a78f7cc3cfb5ee86bc46132fe91c2295341fe. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/VNA2F2403228 — a six-check JSON result.
      date published: 2026-07-04T10:04:33Z
    audio: UNFORGIVING
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 133.021
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.843
      additional property: Energy
        type: PropertyValue
        value: 0.675
      additional property: Speechiness
        type: PropertyValue
        value: 0.039
      additional property: Acousticness
        type: PropertyValue
        value: 0.037
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: L U V U
album: O

Instrumentalness
type: PropertyValue
value: 0.001

Liveness
type: PropertyValue
value: 0.111

Valence (Positivity)
type: PropertyValue
value: 0.606

Loudness (dB)
type: PropertyValue
value: -7.046

Key Name
type: PropertyValue
value: Bb

Mode Name
type: PropertyValue
value: Minor

L U V U
type: MusicAlbum
date published: 2025-05-15

O
type: MusicAlbum
date published: 2025-07-26