{
  "manageEntity": {
    "action": "Save",
    "entityId": "1837929443",
    "entityType": "Track",
    "nonce": "0x960ba98a5455160e7c6d23e5d9d382132c637ebe4f05659a5278e569491281a4",
    "signature": "0x7955d1a6e5f6373c716a3e4e74df5fcf49c3ca7df3bd7f3737a5113998e4e70c6b44e1a74b68fb41fd969ee56a706a40d3cbdecafdb7930c136b8f7f5e9267b21c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}