Ask HN: What would happen if Bitcoin value went lower than the cost to mine

https://news.ycombinator.com/item?id=5533909

by hoffsam • 13 years ago

5 5 13 years ago

news.ycombinator.com

If mining bitcoins became unprofitable and people stopped doing it en mass, then who would verify transactions? Would the system cease functioning correctly?

wmf• 13 years ago

Rational miners would indeed stop mining, but fanboys would continue mining at low difficulty. (Keep in mind that some people are using "free" electricity, so their marginal cost is basically zero.) Then someone might do a 51% attack just for the lulz.

Fzzr• 13 years ago

My understanding is that Bitcoin production difficulty is inversely proportional to the amount of power being spent on mining. If the price of BTC drops so much that it's not worth it to mine and some people stop, the difficulty will drop and it will thus be more worth it for the remaining miners.

suki• 13 years ago

The difficulty of mining slides up and down depending on the block rate.

As the profitability drops, some miners will stop, the block rate will drop and the difficulty will drop until things balance again.

hoffsam• 13 years ago

But I wonder if there is some kind of minimum amount of mining required to verify X number of transactions. If there are many transactions, but few miners, then would transactions begin taking too long to become verified?

bdr• 13 years ago

Yes, there is a byte limit to the size of a block. If blocks become infrequent enough due to decreased mining power, it's conceivable that a backlog of transactions would build up. At the next difficulty adjustment, though, speed would pick back up again.

Ask HN: What would happen if Bitcoin value went lower than the cost to mine

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