it will be hard to know if someone trying to attack the bitcoin network but if there is someone who wants to attack the bitcoin network it will quite pricey because I saw on another website that it takes around 700k~1m USD to be able to do it and it's only for 1 hour of the attack.
If you are talking about an attempt at a 51% attack, then it costs more than that, to attempt a 51% attack on the network would cost billions of dollars, that's if you are successful in buying the equipments needed, and your attempt could still fail or may not last for more than a few minutes, so it is an impossible attack.
As for attacking or bruteforcing on taking down Bitcoin, then pretty sure that government had long time been trying out on doing so but even up to this day, they had completely failed.
I don't feel any government is trying to take down or attack the BTC network in this way, they cannot be spending money on an unsuccessful attempt when that government can just ban BTC and BTC mining in their country.
Attack on the Bitcoin network? That's not possible cause it is something that's handled by miners i.e. BTC miners execute two things that are transaction confirmation and securing the network.
It isn't handled by the miners in and of themselves, it is the pow or consensus mechanism that ensures security of the network, and anyone in the community can parkate in this without being a miner, they just have to run the full BTC client and they are a part of it.
