{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0e2f77d4bf728fdac7ee4ca21894fdb61488fea858ba68abe2c5b49250f72b52",
    "signature": "0x67bbf58f34f328825e9c8986241b66264033143073af9e45902e34134c4493a16f8991dcb9c9940600a4d056fd1a6c769b1299f32d021e56dd5d7c3509fb8ffe1c",
    "signer": "0x3D21fd437e65B00cA2BeC485a4e143b28572B434",
    "userId": "59445957"
  }
}