{
  "manageEntity": {
    "action": "Save",
    "entityId": "389310019",
    "entityType": "Track",
    "nonce": "0x66c409696cc3ce3fece5cf85bb3b5cbf13233927e106ea6f1f259a0c70f7032e",
    "signature": "0x619bda73abbde5ea499ccc3671793b1bd486ad3d31205b5ebcdcb2fd30800dac13d5d4fc39b93e95a807290c3ec4b4ba4b27fffc20cc2d67691c42a745399fe21c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}