{
  "manageEntity": {
    "action": "Save",
    "entityId": "728866",
    "entityType": "Track",
    "nonce": "0x998b89ff8e5a3479ab1cb8bc97866cc5deac163aa2df7023adb9cef41177260c",
    "signature": "0x8891cd7bf2a6021a688a65247cde6a3865f1eebfd00164f7d6409b33a08efd552f0cac2a900af3ac4cfc71890b04c9a34c5787dde408e66efa2f501290051e231b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}