{
  "manageEntity": {
    "action": "Save",
    "entityId": "1503683375",
    "entityType": "Track",
    "nonce": "0xc8411e1f0407e5ecb6485e8b9a1ecf9e04e83a47f69269a0e93c88a431107b04",
    "signature": "0x79a764461fc3e96e1eb46ab8a3b1c7a4ab1e6d03ee407c7ad8e581f61d071a22062366d16d42808ae9a0d150b53a50e4a5647b4a24f69fcff935a12f8528e9541c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}