===== Hard Fork =====
[[dido:public:ra:xapend:xapend.a_glossary:start| Return to Glossary ]]

A **hard fork** (or sometimes **hardfork**), as it relates to [[dido:public:ra:xapend:xapend.a_glossary:b:blockchain|blockchain]] technology, is a radical change to the [[dido:public:ra:xapend:xapend.a_glossary:p:protocol|protocol]] that makes previously invalid blocks/transactions valid (or vice-versa). This requires all nodes or users to upgrade to the latest version of the protocol software.

Source: [[ https://www.investopedia.com/terms/h/hard-fork.asp | Hard Fork ]]