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GNU Taler v1.0 released
(www.taler.net)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I'll stick with monero.
Don't view keys in Monero "expose information to the authorities" if used in such a way? Hard to see the need for a system where tokens can "expire" when we already have a perfectly good one where they don't.