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A hard fork is really a radical improve to your protocol which makes Earlier invalid blocks/transactions valid, and therefore involves all buyers to up grade.ا?أ?راد ا?أع?ا? ا??ط?ر?? ا?بدا?ة ??? ?ع?? ?جب ع??? ?عر?ة ا??صادر: wallet??or maybe a ??cold|chilly} wallet.??How you can Use Bitcoin Bitcoin was in the beginning d