{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618557208",
    "entityType": "Track",
    "nonce": "0x36295abb6b57b9d7197725a840b783d36eef89d33a9db059e663e068f5068cd4",
    "signature": "0x4e38e5cb91e1b4ff87f951d3a26540fcc46c87c4ff6f721dcdfa977e3090c77a7e3e928564b6c2a4b379d77ab208f539a52c442de5e21f417877c95628b511d31b",
    "signer": "0xf63b89A0Bbc03C7ec59aC257C7082A056082cDB8",
    "userId": "558452493"
  }
}