{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf9b19916505abc19d94b936b54d6a523e0f2bd54fe16674d7bd6233610e2c9ec",
    "signature": "0x698754a3049f63e239e2a8f172de5d1617618ed580edf647c33ca99914cdebaf162a5e16a7183c3d82d3950f789d5a3d3645669ffd10ee3ad174cd52282968171c",
    "signer": "0x80BaBdd7604de656E45b52EFA056548D7C078B36",
    "userId": "790313179"
  }
}