[Cryptography] ghash.io hits 50% of the Bitcoin compute power

[John Levine]

>Do millions of people actually store and check the complete block
>chain on a routine basis?

I'm running Bitcoin Core 0.9.1 on my laptop, which I spin up every
once in a while to update my copy of the blockchain.  I have no idea
what it would do if it started getting lots of messages saying whoa,
there was a fork 100,000 blocks ago and here's the new version of the
blockchain.