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A hard fork is actually a radical alter to the protocol that makes previously invalid blocks/transactions legitimate, and therefore needs all users to enhance.ا?أ?راد ا?أع?ا? ا??ط?ر?? ا?بدا?ة ??? ?ع?? ?جب ع??? ?عر?ة ا??صادر: wallet??or simply a ??cold|chilly} wallet.??The way to Use Bitcoin Bitcoin was in the beginning