“But if Bitcoin is ever used by enough people so that blocks are 90 or even 100 percent full, the network could become congested to the point of unusability. The solution, Andresen believes, is to increase the size of each block to 20 megabytes by 2016. How? By changing Bitcoin’s underlying protocol and splitting the blockchain into two different versions—one using 1 megabyte blocks and the other using 20 megabyte blocks.” Read more