The Kamkars
type: MusicGroup
description: The Kamkars (, ) is a Kurdish musical family group of seven brothers and a sister, all from the city of Sanandaj, the capital of the Kurdistan province of Iran. The group has performed numerous conce
popularity: 9
followers: 541
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fa2cdd8faccc6a3c7cdd90bd370a722127fbd6a9e6eb73d1b5f5b29576f69c. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a30d4d59-f2d4-4403-89be-015693767f2e.json and https://artists.proofprofile.net/proofs/artist/a30d4d59-f2d4-4403-89be-015693767f2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T08:57:02Z
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album: Zardi Khazan
  type: MusicAlbum
  date published: 1987-10-13
album: Shlire
  type: MusicAlbum
  date published: 1992-05-01
album: Shabahengam
  type: MusicAlbum
  date published: 1993-08-02
album: Biyabane Bi Karan
  type: MusicAlbum
  date published: 2003-03-07
album: Awrad
  type: MusicAlbum
  date published: 2005-06-15
  track: Halalay Tanya
    type: MusicRecording
    duration: PT7M6S
    duration ms: 426370
    explicit: false
    by artist: The Kamkars
    in album: Awrad
      type: MusicAlbum
      date published: 2005-06-15
    isrc code: FRS182103616
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    additional property: CopyrightStatus
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    additional property: OTSVerificationAPI
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    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T20:02:03Z
    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 0xcac88f4eecf9b475a21aebf3a5d3177c309fe26cda6656c387b351ef23f49d73. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:02:03Z), 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/FRS182103616.
      date published: 2026-07-21T20:02:03Z
    audio: Halalay Tanya
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 73.953
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.488
      additional property: Energy
        type: PropertyValue
        value: 0.286
      additional property: Speechiness
        type: PropertyValue
        value: 0.031
      additional property: Acousticness
        type: PropertyValue
        value: 0.883
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.135
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.333
      additional property: Loudness (dB)
        type: PropertyValue
        value: -7.482
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Iran Zamin (Concert In Sweden)
  type: MusicAlbum
  date published: 2007-03-01
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  type: MusicAlbum
  date published: 2009-03-01
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  type: MusicAlbum
  date published: 2010-03-01
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  type: MusicAlbum
  date published: 2010-05-02
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  type: MusicAlbum
  date published: 2011-01-12