Find a Bitcoin seller you can trust, bury the money on a secret public location, share it with the seller, give him enough time to get there and avoid trail cameras without you seeing him (so 3-6 months), and after counting the money he'll send you the Bitcoin.
The real question is: why do you want to be fully anonymous, with all the risks involved, if you can simply buy at Bitonic? Are you planning a €5 wrench attack on the seller, or did the money have a criminal origin?""""
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OP dont listen to this you are right to want be fully anonymous especially in netherlands where they want to tax unreliased gains, also dont burry no money or any of that ,this guy is paranoid and too scared
to do any type of irl deals so he gives wrong advices and calls everyone a wrench attacker or a scammer,
ignore that just go on localcoinswap

and chose the highest rated dealer in your area, if you pay with a wire go with cryptocoop he has 30k trades takes wires from personal and business account
if you pay with cash go for tradepath he has 5k trades but some of my customers told me he sends intermediates to do the deals for him its kind of annoying but its better than going to deal with someone who has only a few ratings
also try with a little bit of money at first to get confortable and chose usdt instead of btc because btc is slow it can be awkward at first for you to wait 30min for btc to arrive lol use usdt erc20 its 10 seconds (swap it latter for some btc yourself)