{
  "manageEntity": {
    "action": "Save",
    "entityId": "661881533",
    "entityType": "Track",
    "nonce": "0x1700a8d5ef7311010a558a55fccce2deb93a6c4471ee56d76e80161641859edb",
    "signature": "0xe3b01b0a9a04047bb81d14cd014b9311a02a9799608c4f2d7af82e7d82aefec07cc0add3b5b2a81e7bde9ee022f336fba9e38a18cd0a644db3a709beddb4bd421c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}