Wins come from the Google Sheet. Add a row there (Date, Amount, Note) and the sign follows within a minute.
For italics or bold, wrap words in <i>…</i> or <b>…</b>. Nothing else is taken as HTML.
What had been won before this clock. The wins you enter add onto it.
The top number ticks up at this rate after each win. Entering the next win trues it up to the recorded total.
Columns: Date, Amount, Note. In the sheet: File, Share, Publish to web, then paste the link here. With a sheet, a new win is a new row, and every copy of the sign, embedded ones too, updates itself.
Everything is kept in this browser only. Nothing is sent anywhere. A copied link carries the numbers and words in the link itself.