Cryptocurrencies are vulnerable to attacks targeting the network routing layer. In this guest post, Apostolaki, Zohar and Vanbever show that BGP attacks are back, and this time, they have a high value target.
Evidently, a requirement for becoming a CEO at a Bitcoin exchange or payments company is to believe that your company has no power and works entirely at the discretion of the miners. I try once again to correct this myth.
I make the case that Bitcoin users have just as much of a say, or more, than all the miners combined. They wield this power through exchanges, and the exchanges need to live up to their responsibilities.
Peter Tschipper has been looking into compressing the Bitcoin messages on the wire using generic compressors. In this post, I discuss why generic compressors will not work well with Bitcoin, make the case for a custom compressor, and suggest that we run a community challenge to develop the best compressor.
In a new analysis of Bitcoin mining, Ittay Eyal shows that the equilibrium between miners is unstable, and identifies a stable equilibrium that might, as a side effect, reduce the size of open, public mining pools.
We outline a small change to the Bitcoin mining protocol that rules out big, public mining pools. It preserves the current investment in Bitcoin by both existing users and by existing miners. It presents a fix to GHash's recent 51% excursion.
A Bitcoin mining pool, called GHash and operated by an anonymous entity called CEX.io, just reached 51% of total network mining power today. Bitcoin is no longer decentralized. This note describes what we should do about it.