{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7337fff042780894fb60b39afb5e3205fb11bbde5bf1322bc1256a8d459a4427",
    "signature": "0x7c0ceb6ccda442596bd9ded8abca9e04c4d64be0452beef4d0f864e3529296ee35e57e0cb11f99259471923cba6e385e0e080163339a918ce3d121c0131f36c41b",
    "signer": "0x8Dea73E7469D1fD9afD89b5FDC44718F071B8A93",
    "userId": "144754510"
  }
}