Bitcoin XT or BIP-101 (Bitcoin Improvement Proposal -101), put forward by two Bitcoin Core developers – Gavin Andresen and Mike Hearn, had 11 January as the date to commence introducing larger 8MB blocks to bitcoin users running the XT software, CoinDesk reported.
The implementation of the project required 75 percent of all the bitcoin node owners to adopt XT, which would have increased the block size from the present 1MB up to 8MB, and doubling every two years until a block size of 8GB was reached.
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http://www.econotimes.com/Bitcoin-XT-Fails-To-Get-Consensus-At-Its-Commencement-Date-141615#fDE9UphId8Yw3wlp.99
