{
  "manageEntity": {
    "action": "Save",
    "entityId": "506564610",
    "entityType": "Track",
    "nonce": "0x14578ab52cd2f64aab42365a63cff71750b8dc0284d99a69f716185cb2c56655",
    "signature": "0x51268c74bf0e9710fdb61a41f50786c8c8890534ce99501c684ff07f056edae425c51f276b8815c64af9878bbeec6705a8ea8ba57e010293f989982024f895311c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}