Earlier quoted context omitted.
>How many people can authenticate a dollar bill? [...] nobody can audit these things. USGOV has a pretty comprehensive guide on how to validate them: https://www.uscurrency.gov/sites/default/files/downloadable-...
Please note the entire absence of the dollar bill from that document.
A fair point. I took "dollar bill" to be the generic "US currency" rather than specifically "the $1 bill". But this page covers everything from $1 to $100 (although it seems the $1 and $2 have barely any.)