Thank you all for responds.
It means a lot to me that someone at least care and is trying to help.
I hope that I will be able to find someone who could help me to find this man or find different solution to get back my funds.
Before this transaction I was really passionate about all cryptocurrency transactions but now I see that it is not as safe as they claim to be.
I think that Blockchain should inform their clients that transaction can be cancelled even if receiver see money on his BTC wallet.
I tried to contact them reaching for help but they told me same things like you that once it was done it cannot be reversedd.
I'm trying not to victim-blame, but being scammed has little to do with the medium. My grandfather once told me a story about how he was scammed by a fake insurance salesman that took an equivalent of about 4000€ in cash, over 60 years ago that was a little more than a years's wage. My brother in law got scammed by door-to-door salesmen numerous times, they keep on selling him fake products for a premium price, and he keeps falling for it.
Our newspaper reports scams on a very regular basis, and it's very rare to see bitcoin to be the medium.
The main problem was the fact you used a medium you didn't fully understand to transfer a huge amount of money...
Once again: it's the scammer's fault you lost your money, not yours, but saying things like crypto "not being as safe as they claim to be" isn't completely fair. Crypto is really safe. It is well documented how it works, and anybody who's giving out real information will tell you crypto currency's are irreversible and should not be sent to anonymous people you don't fully trust...
If you use it like it's supposed to be used, you should be fine... You should compare it to other irreversible payment methods... Would you have sent gold to an anonymous mailbox in nigeria if a scammer asked you to do this?
Now, it seems to be i was wrong... In the list of addresses you posted, i saw transactions of ~0.4 BTC (~$15k at current exchange rate), but apparently the one that was used to scam you was > 3 BTC. For this price, it might be a reasonable idear to hire a professional blockchain analysis company...