Ethereum, not Bitcoin, got hit by a computer attack. Can apparently only happen when a single (ill-intentioned) group does >51% of hash calculations. So BTC would not be at risk but other 'little bits' all would. Almost $500,000 in Ethereum Classic coin stolen by forking its blockchain | Ars Technica Bitcoin continues in 3K to 4K USD range.
out of curiosity, i read the wiki on cryptocurrency. unfortunately, most of what is in there is above my pay grade. i did read some interesting things like countries where major mining is being set up due to the low cost of electricity, or availability of renewables. and one government, iirc, was trying to do something about their poor internet infrastructure so that minors would set up shop there oh, and ohio is now taking crypto payments for state taxes
CDN$190 Million Bitcoin inaccessible, supposedly by the death of the exchange's founder (loss of password), but not without suspicions of dirty dealings: Cryptocurrency Exchange Says It Can't Access Millions After CEO Unexpectedly Died : NPR
This departure from existence seems to represent about 0.3% of total bitcoinage. Which is either a lot or a little, depending on how one looks at it. There about 1.7 trillion of US currency in circulation. If a like fraction of that went walkies, it would be about $4.7 billion. One could build a lot of wall with that
