It's just a digital signature from what I am understanding. The same thing accepted by the federal governments executive branch for every IRS tax form I've submitted since 2006 when I started working.

If they believe a digital signature doesn't count, the executive branch should return all taxes paid with digital signatures immediately and ask we resubmit them come April when taxes are do again.

Edit: oh, also near all student loans are signed digitally, so they need to void those all as well.