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A hard fork is a radical improve on the protocol that makes Beforehand invalid blocks/transactions valid, and as a consequence demands all customers to improve.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.??How you can Use Bitcoin Bitcoin was at first built