🍪 Cookies
We use analytics cookies (Google Analytics) to understand how you use the site. You can accept or reject them — the site works fully either way.
A hard fork is a radical change to a blockchain's protocol that makes previously invalid blocks and transactions valid, or vice versa. It requires all nodes to upgrade to the new software; those that don't will operate on a separate chain. Notable hard forks include Ethereum Classic (from Ethereum) and Bitcoin Cash (from Bitcoin).