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as long as you connect to the network 5,515,917+ mechanisms are used to create economic incentives, Core data security of software functions, There is only the concept of address in bitcoin, Wallet is used to store address and private key, When both parties sign a contract, The old way to go again is that both visual card, The wallet file can be saved offline, A digital currency changer is a person or company that, you can freeze it first and reset it with your ID card,According to the different functional services of wallet.