{
  "manageEntity": {
    "action": "Save",
    "entityId": "1977433399",
    "entityType": "Track",
    "nonce": "0x7a3f65392e552fcdcc8e5838f25f978df359a85683560741fe6a60e4d891eed0",
    "signature": "0xe538fe25725ac96a4363f978318424e7fb392c6144376c4aebf2602bad1c4c0b75b83837988695e0337f0d05ed890434eae87ff956301e099e9f732f6cb247fb1b",
    "signer": "0x44Fe9338D9d1405927C73FDA0be0F36ae481Cd39",
    "userId": "983568397"
  }
}