{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x49f2892e509376879d71de28320dce2ea071a786b591fd961c861c5f70a4951d",
    "signature": "0x066ad53c34c61c4a13068cde6e5bb28341366c85240e6e20b35f3d7a98a53d6a5c20a497171aa0fa6044e3ba76c834c0972a3f211dc9f3a14ea182324b561e1e1b",
    "signer": "0x7f7f6bdC1d2aaC9820bD5671Dc1F4A87cbd42138",
    "userId": "390757040"
  }
}