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Re:Finland tax authorities matching Bitcoin transactions and... by brlewis on Friday April 20, 2018 @10:47AM (#16885180)
https://en.wikipedia.org/wiki/Ex_post_facto_law#Finland

"Generally, the Finnish legal system does not permit ex post facto laws"

Re:Finland tax authorities matching Bitcoin transactions and... by zokier on Friday April 20, 2018 @01:16PM (#16886604)
Strictly speaking I don't think this thing is a law, but rather a policy. Also the same paragraph continues

> In civil matters, such as taxation, ex post facto laws may be made in some circumstances.