http://walletdvl5avrmoxk2fwsf5b76zkmbkoo3r6kqeesq5hsgnq7xhbciad.onion/what-is-bitcoin-fork
However, a hard fork is very constraining for all participants and it is therefore very difficult to obtain a broad consensus, resulting in a pure split and the creation of a parallel blockchain. The success or failure of a hard fork lies mainly in the degree of conflict it generates when it is created.