{
  "manageEntity": {
    "action": "Save",
    "entityId": "931540003",
    "entityType": "Track",
    "nonce": "0x4742e0970dd98fbd6629d4ebb7de2c265f6a7cf7c2a4c2b8a3a1848bb4f7d72f",
    "signature": "0x8cb94d2194552f8fef742bdc401cdadcda52db8e430c8c1b81bd1683cc7ce0685b60c739fdf20ce0812f26ca510a156b4e6cdcbf452d9422269353db133597221b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}