While the cryptography might be resilient [1], in the real world people have been getting their bitcoins hacked and stolen very very commonly.

The ecosystem has some serious issues to solve for it to be ready for an everyday user.

[1] https://lbc.cryptoguru.org/about

if i knew how, you would know it by now. but you can't prove it's unhackable either

Owning >51% of the mining power for a sustained period would make it impossible to trust and presumably eventually wipe it out. The hashing power is frequently compared to small states, so a large state could presumably put together enough hashing power to sustain such an attack.