{
  "manageEntity": {
    "action": "Save",
    "entityId": "1508621734",
    "entityType": "Track",
    "nonce": "0x17e1384dfcfd4089e75eed6403ef8c78e139ed0bf88ca7e7adf4c2f836632642",
    "signature": "0x360e4623c92f589f3df2d1cf96ff88f210c5c87aa08658b9187932f0f0b051a9785c92d114184d08fea3c5ac03414aa0334c3026ea844132eb6083d1b0a391ac1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}