{
  "manageEntity": {
    "action": "Save",
    "entityId": "901871700",
    "entityType": "Track",
    "nonce": "0xcb9d5b1f540a04799db287e406269feea3feb99d1bed78640c17f77a4d3a114a",
    "signature": "0x349a2268f9c3b18b153c06435ad6f163e16d14528c3fcd472933f0401a2b0fd410053463920d98394c8f0540fb3d538c31fd3a9840a445b8ec6bda79b33f297a1c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}