{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x92ee3d1ab4d765b1442cf92b03ae2f6dcf8cb81d009c9055149e12bfc5398ece",
    "signature": "0x7e5a7c971e7d18e16a02bba5ddb677a5161e17210435210bd86be7367936d69b1329493df2d20f87191e93ccafd869e09dd4bcf823127a04d5a106c2e18d37a91b",
    "signer": "0x604b4F353E759e6Ceb980b2Fa04e96FE85AC7d1D",
    "userId": "235338"
  }
}