LevelDB is a popular data back end and in use at Google, Facebook,
and many startups. In this article we discuss some concurrency
improvements we've made to LevelDB as part of the HyperLevelDB
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.