Transfer long text or small file by QR code movies It can be used to transfer data when security is more important.
sudo apt-get install python-zbar
sudo apt-get install python-qrcode
git clone https://github.com/huanghq/flipqr.git
cd flipqr/
python flipqr
btc: 194qRKhLATLoYsF6V9ficUXEh9FVsHXqQA