{
  "manageEntity": {
    "action": "Save",
    "entityId": "1497751200",
    "entityType": "Track",
    "nonce": "0x3db2f0dbcf29ba004ecd25195e8c4132676cca52a993b3f6a61f0efa3875ae51",
    "signature": "0x4e06cc3330e24f8250124f917233c81535a9a4d7937f1f618fb479a4307cc8c4762346cc31cd74737a0f398fa365754f17b1eb92762f5483e8b9132d071c37391b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}