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New "fork", or change to bitcoin's software, proposed called Segwit2x.
The changes, set to take place on or around November 16, are aimed at speeding up bitcoin payments over the blockchain network.
Not everyone in the bitcoin community agrees with the changes and fork has the potential to split the bitcoin network in two.
URL: http://uk.businessinsider.com/bitcoins-segwit2x-fork-explained-when-why-2017-11