{
  "manageEntity": {
    "action": "Save",
    "entityId": "1303380455",
    "entityType": "Track",
    "nonce": "0x397fb27284e13e93cb77b3cae49e5ae1c98573d47960dfbbbe643061b64d415e",
    "signature": "0xbb528a1372c75435e2782eac4fc2ec0e6ae4d80784f87af187e4a536627c8571312b7a5a58bfdfe36895529b18355b634befb840ff06a6fc4046817607f92c1a1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}