I possess a non-trivial amount of bitcoins, I sold some. It's really impossible for me to figure out what I got those specific bitcoins for, especially since this was around when bitcoin was at around $1k a pop so selling 7 or so was absolutely nothing for me.
According to Finnish law money laundering is activity where someone receives, spends, transforms or transfers illicitly obtained (this is a bit difficult to translate but the law specifically says "acquired by crime") property to cover up or disappear the origins of the property.
Logically you shouldn't be able to be convicted of this without proof that the crime actually happened, but apparently not here. Lighter sentences seem to make it easier to wrongly convict people, especially when it's extraordinarily rare for them to actually end up in prison.
Are you saying that you provided to the court evidence of your legitimate business which accepts or transacts Bitcoins for services that it is impossible for you not to know about, in the process of which you acquired 7 or so Bitcoins (transactions for which will be on the blockchain), and then you sold them for a higher price at a Bitcoin exchange (transactions for which you should have receipts and email correspondence for) and they didn't accept it?
You don't have to answer any of this, obviously, it's just hard to believe there isn't more to it than what you're saying.
Even if he couldn't really remember what his business was selling, he would still have receipts, records and/or emails demonstrating that the source of the 6000 Euros was a legitimate Bitcoin exchange, as a result of the massive increase in price.
This was also before the tax authority clarified on their stance on bitcoins, before that everyone was under the impression that you wouldn't have to tax your coins until you exchange them to real currency.
And that's ignoring all the coins I mined way back, it's literally impossible to attribute that transaction to any specific source.
Expecting some sort of bookkeeping might be reasonable with real money, but not with imaginary internet money.
And FWIW the investigation regarding me and LS was dropped a few months ago.