{
  "manageEntity": {
    "action": "Save",
    "entityId": "408107305",
    "entityType": "Track",
    "nonce": "0x6295193ae5514b771128fdefffbd3c1dbd7203718b3ea00a997a9534ff3ea900",
    "signature": "0x0ccc3d7cf80ef0d063a95ae4df018c6bda678bc4daaebaf94463629821e19977623c1a6f7baeeed493265eef81afdcdf03e5bd7ddd7a5bbb011b1a4fcdf86c5e1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}