{
  "manageEntity": {
    "action": "Save",
    "entityId": "768776",
    "entityType": "Track",
    "nonce": "0x2472d66a15b7543678c72f152907ff164e7f499d521a5059cb7a22d3b6fd89a4",
    "signature": "0xec546337ab8decc7a4154aa67829b311e6822a67835fa305885d98a1585d757252bb1fd44572f2aa5a8cacbf61c5a4e4019024677a49ac5af099a0ad6bbdbaa81c",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}