This one was on the front page a few days ago and I can't remember who made it so I'll ask here.

Basically it was something where you'd type in a message up to 80 characters iirc which would come out as a solid green block. you'd save that solid green block as a stamp, put it in a reader, click a button and your message would be decoded.

I was wondering what save ID that was too.

Thx