[gregsadetsky]

There's a nice JavaScript/node version of the decoding code that you can run locally on the shc:/... QR code value here:

https://gist.github.com/remi/e3aa2f78845ee13f706ed83aead5145...

There's also an online version (that works on mobiles and desktops) and decodes everything on the client side:

https://fproulx.github.io/shc-covid19-decoder/