{
  "manageEntity": {
    "action": "Save",
    "entityId": "460514",
    "entityType": "Track",
    "nonce": "0x78910cb2d4458b1d29c1e8c507288c114940b947806371ec1524ca6d72c79ac4",
    "signature": "0x88ebc4f51b9a66e93f2dd4c497af40b6975436aeaa8568a5e2a3bba93b36657744e857635f99da292f8e0f00efde7ae4ef74aa6934f8f7caea3985a5fe398e511c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}