Black City
type: MusicGroup
popularity: 12
followers: 1799
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7b9063cdcd376b63e6a84891265001d564bfe85a678c961ed6428eb92a18d4c2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953754
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953754
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/af4a2ce3-674c-4948-88c9-ea0986071706.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/af4a2ce3-674c-4948-88c9-ea0986071706.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/af4a2ce3-674c-4948-88c9-ea0986071706
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T06:45:19Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7b9063cdcd376b63e6a84891265001d564bfe85a678c961ed6428eb92a18d4c2","name":"Black City","registered_at":"2026-06-14T22:51:22Z","symbol":"NIM0601593","token_address":"0x99c47227e6c1f72bac8090a51c8a2ecc6d7905c7","type":"artist","uuid":"af4a2ce3-674c-4948-88c9-ea0986071706"}
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 0x7b9063cdcd376b63e6a84891265001d564bfe85a678c961ed6428eb92a18d4c2. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af4a2ce3-674c-4948-88c9-ea0986071706.json and https://artists.proofprofile.net/proofs/artist/af4a2ce3-674c-4948-88c9-ea0986071706.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T11:57:35Z
  text: {"copyright_id":"0x7b9063cdcd376b63e6a84891265001d564bfe85a678c961ed6428eb92a18d4c2","name":"Black City","registered_at":"2026-06-14T22:51:22Z","symbol":"NIM0601593","token_address":"0x99c47227e6c1f72bac8090a51c8a2ecc6d7905c7","type":"artist","uuid":"af4a2ce3-674c-4948-88c9-ea0986071706"}
album: Black City
  type: MusicAlbum
  date published: 2010-01-01
  track: Summertime
    type: MusicRecording
    duration: PT2M50S
    duration ms: 170253
    explicit: false
    by artist: Black City
    in album: Black City
      type: MusicAlbum
      date published: 2010-01-01
    isrc code: DKUM71000028
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T18:48:25+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x4dcc19eeb98d639a9554a55827f5cf9971124cd5e328da75f0cd5d40be027860
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958924
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958924
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKUM71000028
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T21:50:37Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dcc19eeb98d639a9554a55827f5cf9971124cd5e328da75f0cd5d40be027860. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:50:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKUM71000028.
      date published: 2026-07-20T21:50:37Z
    audio: Summertime
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 163.033
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.409
      additional property: Energy
        type: PropertyValue
        value: 0.976
      additional property: Speechiness
        type: PropertyValue
        value: 0.084
      additional property: Acousticness
        type: PropertyValue
        value: 0
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.612
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.582
      additional property: Loudness (dB)
        type: PropertyValue
        value: -4.325
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Summertime
  type: MusicAlbum
  date published: 2010-01-01
album: Here Comes The Rain
  type: MusicAlbum
  date published: 2013-02-04
album: Fire
  type: MusicAlbum
  date published: 2013-02-25
album: Fire
  type: MusicAlbum
  date published: 2013-02-25