{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x15e523ab1af5851c5049e797071b02f98f4d1113a25d9f9b0228b586aee5cebb",
    "signature": "0x7758e0d57c8409272725e213d85338fbaaa60d4934346b7d4b53a1e08962d30d797c92a370b0537628e0b904399e3e9c8539ca8ef18b5ba3ee04ad635b8db2361c",
    "signer": "0xEFAB3332CD5EA33e9817aa57B32CaCb8Acf973A4",
    "userId": "407216161"
  }
}