{
  "manageEntity": {
    "action": "Save",
    "entityId": "577790",
    "entityType": "Track",
    "nonce": "0x5730afd00aafb704b58295d84ce5f97b90dfd4face644ecf669cc0e1b795f3c3",
    "signature": "0xff35039ecc7027442a6b18b9f1b414d33e03f91dfd22f63503ecc91f0a562d254d0554a0252fd12a8318bb25549c406f5a18d8dc8a1230b49060e11578fa78a71c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}