Today the scheduled network update of Bitcoin Cash, also known as BCH, began. Rival implementations Bitcoin ABC and Bitcoin Unlimited are currently ahead of another implementation called Bitcoin SV. Bitcoin ABC and Bitcoin Unlimited are leading in both the number of nodes in operation and hash rates. More than 40 blocks have so far been mined under the new network rules, with Bitcoin ABC leading by about a dozen blocks. Due to the update, leading digital currency exchanges all over the world have suspended all activity involving Bitcoin Cash. This includes both trading activity and withdrawals. The "ABC" in Bitcoin ABC means "Adjustable Blocksize Cap," and its implementation represents only modest changes to how Bitcoin Cash operates. These changes include eliminating bottlenecks in the software and letting those running nodes adjust their block size limit. The implementation, which is supported by leading cryptocurrency enthusiast Roger Ver, is based on the premise that Bitcoin Cash is fundamentally sound and does not require extensive changes. The "SV" in Bitcoin SV means "Satoshi's Vision," which is a reference to Satoshi Nakamoto, who is the legendary creator of Bitcoin. This particular implementation is supported by Craig Wright, who has claimed that he is in fact Nakamoto, and it offers far more extensive changes to Bitcoin Cash. Among these changes is increasing the current 32 MB network block size to as much as 128 MB. The Bitcoin Cash update has caused lots of contentious debate within the digital currency's community. Chief among these disputes is one between Wright and Jihan Wu, who is a co-founder of Bitmain, which a leading Chinese manufacturer of Bitcoin mining equipment. Wright, in particular, has made lots of seemingly outrageous accusations and threats against both Wu and Ver. The disputes could not only threaten how Bitcoin Cash operates now and into the future, but many believe that they could affect the wider cryptocurrency industry as well. Bitcoin Cash was created in August of last year as a hard fork of Bitcoin. It was done in response to rising Bitcoin transaction fees as a means of increasing block size limits.