{
  "manageEntity": {
    "action": "Save",
    "entityId": "1537255938",
    "entityType": "Track",
    "nonce": "0x2310cd021edbec11cb0945e4531e5f9d01461e177aa54d420074990b7ca3cce1",
    "signature": "0xd9a5ae1b792a8607dea1f7e4b806ccaa9a455b4e25a9784589e9e433dfc91cee7230a0b40bd074518f9c517a29c30e1cd38bd736d1ef0dcc7367609b92ff72ef1c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}