{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4c56c2c5ecd7c772515a177ad4ca5ea2203dc88eb6ccb63559700657350bf1bb",
    "signature": "0x8c079c990c5fda8442598b3dd0e65eaa2dd2c35632cae3e827ec79d76a4e16f9093f2c61153391f17024fbf37ced8d44666f6def945270eb9087be3c0128219a1c",
    "signer": "0x43dCdB533Bf127Eb0De34a31D2C1bD2D9e0C9482",
    "userId": "768051251"
  }
}