#Bitcoin has only had two updates that had to be made via hard fork.

- 2010 – Fixing the overflow bug, which allowed the creation of 184 billion bitcoins.
- 2013 – The Berkeley DB bug, which split the network and required an update to prevent further division.

There have been several other proposed updates via hard fork, but none of them were successful.

Here is the list:

- 2014 – Mike Hearn attempted to increase the block size to 8MB but failed to reach consensus. He honorably gave up and sold all his bitcoins.
- 2016 – An attempt to increase the block size to 2MB failed to gain consensus. In response, Bitcoin Classic was created in an attack on the Bitcoin network.
- 2016 – A proposal was made to let miners decide the block size. Without consensus, it was abandoned.
- 2017 – An attempt was made to increase the block size to 8MB, without SegWit, to prevent the adoption of the Lightning Network (LN). Without consensus, Bitcoin Cash (BCH) was created as an attack on the Bitcoin network.

From that point onward, no further attempts were made to update Bitcoin via hard fork. All subsequent hard fork attempts focused on Bitcoin Cash (BCH).

- 2017 – An attempt to change BCH's mining algorithm led to the creation of Bitcoin Gold.
- 2017 - An attempt was made to increase the total supply to 210 million, add SegWit to support LN, and change BCH’s mining algorithm to x13, resulting in the creation of Bitcoin Diamond.

There have been several other forks, but all of them were based on Bitcoin Cash (BCH), not Bitcoin.

None of these forks or attacks resulted in losses for Bitcoin holders.