{
  "manageEntity": {
    "action": "Save",
    "entityId": "353229050",
    "entityType": "Track",
    "nonce": "0x0e1c828b8f5738afe792e333d57e1fdd148cd1b58ea1504612fa6cdceb07e33b",
    "signature": "0x5025b6bdfddc6787519e7f3cdbdb700350b69cd41a736c51c40f916ee49975f0482b0b4189317fe5667e46f9187ef2d8c4cba9108dfcf9bf6ca7a9b9504bb92c1c",
    "signer": "0xfD008343ab3582261a668335B9CCBe573861B6A8",
    "userId": "483873579"
  }
}