Ethereum

If we had access to a trustworthy centralized service, this system would be trivial to implement; it could simply be coded exactly as described, using a centralized server's hard drive to keep track of the state. However, with Bitcoin we are trying to build a decentralized currency system, so we will need to combine the state transaction system with a consensus system in order to ensure that everyone agrees on the order of transactions.

Этот пост на английском языке. В нем объясняется необходимость комбинирования системы транзакций и системы консенсуса для построения децентрализованной валютной системы, используя Bitcoin в качестве примера.