{
  "manageEntity": {
    "action": "Save",
    "entityId": "1448643348",
    "entityType": "Track",
    "nonce": "0x43f5c2103001accf820c9c05760f94e71325dac2345c0265f22cb776ae271b6a",
    "signature": "0x7c5b1b08f79bf8920c2b08bae0685487a0f0af662764e948a391c1125c9ba3904b8d3dfeda80144bf21a63b45fa3386206bc30a2d9cc2e088eeec199598e10d61c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}