{
  "manageEntity": {
    "action": "Save",
    "entityId": "1581420500",
    "entityType": "Track",
    "nonce": "0x374685764a227a6fe3073a441b4b5fa7b0165497df5dae9ca0d13d97c321a18f",
    "signature": "0xda4d2fed570d723e4673ad7f9ac2a62ba9214b1e2bcbfb927eaf1080f9164f401b8bb375da01d4e7ecee75f35e1bcf0013a5ee10d70014a53aa1e178668eb2b51b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}