@bradfitz ("Brad Fitzpatrick") replied to a tweet by @bradfitz:
When I first did the v4 letter I asked @impl_u64 whether I had to print it, sign it, and scan it, and he gave me some sort of "Boomer, this ain't the 90's, just send a PDF" answer.
So I guess today I'm making a PDF that looks old & legal-ish. Maybe I can rotate it a few degrees.