{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9bbee8aec7a6a06fe580b7865ef43e9776abfb26a3e28886e1b42d2bf6e1f8ae",
    "signature": "0xbce018b5cab1cdd12a6de078cdc35654d2282f36a789881ae8dcf42c8610d45a556a9a883ea56f3ce2cd56b8ddf54af651ee2d4a2070c98d28cf581cc648a1541c",
    "signer": "0xE178a8926535369d63e75CDabE74c05002609f07",
    "userId": "90770329"
  }
}