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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.
Taler does use crypto, aka cryptography, to make sending payments securely anonymous. That is the main point of it.