Since the launch of Bitcoin in 2009, the Bitcoin blockchain has undergone a total of two hard forks. The first hard fork occurred in August 2017, when a group of developers split off from the main Bitcoin blockchain to create a new blockchain called Bitcoin Cash. The second hard fork occurred in November 2018, when another group of developers split off from the Bitcoin Cash blockchain to create a new blockchain called Bitcoin SV.
Other related questions:
Q: When was the last Bitcoin hard fork?
A: The last Bitcoin hard fork occurred on August 1, 2017.
Q: Which was the first contentious Bitcoin hard fork?
A: The first contentious Bitcoin hard fork occurred on August 1, 2017. This hard fork resulted in the creation of two new cryptocurrency tokens: Bitcoin Cash (BCH) and Bitcoin SV (BSV).