{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xdfcbd84a6bc530427400c07181476cbbf2e3ccf194445f8f9081e0971cb354cf",
    "signature": "0xb4bf64a214daa6700e50e0f74ed2467bb1ed09190ef22b6affa27977743a79e8426d0c4f3587e863b7139c8aaeb8c390ab621b9723ae75266671a437abb4e7df1c",
    "signer": "0x1080460F21DCc82D7160d2C77DaAb22a92c4dD22",
    "userId": "162106877"
  }
}