{
  "manageEntity": {
    "action": "Save",
    "entityId": "51349",
    "entityType": "Track",
    "nonce": "0x542f82cf4a6775e386554ba511692ff806dd82f939fd15aa214437366e50292b",
    "signature": "0x7576e850242c9c753faea959d8019cf55c02f7edc3104b20df4fa1b6a485b883708df2984857581398cc9e806dbebe75e8e8eb9b9e8b1dce68982af733b7fa9c1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}