Link to your old account:
https://classic.boincstats.com/en/stats/-1/user/detail/39937370/overview
Link to your new account:
https://classic.boincstats.com/en/stats/-1/user/detail/150689439323/overview
You might need to login to see those pages as you'll be using the old Boincstats skin through those links.
I tried the new one, but it didn't work for me. Probably because I don't allow certain scripts in my browser.
On either page, scroll down until you see 'URL for user signature graphic'.
There's a second URL for just the project you look at, which is Boinc combined on that page.
Also, you can switch to the project list at the top of the page and then access every project's page by clicking the icon at the end of each line in the statistic. First line: Boinc combined, second line: Einstein. If you attach your machine(s) to other projects you'll get more lines to look at.
The list of projects in the sig from the 'URL for user signature graphic' will grow accordingly without any need for user intervention.
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Greetings, Jens