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Morethan100,000practicingdoctorsinpublichospitals,quickonlineconsultation,providingyouwithprofessional,reliableandtimelyone-to-onemedicalconsultationservices.WhatistheprincipleofQRcode?VideotutorialBlockchainisadatablockgeneratedbyastringofcryptographicmethods. 组成的曲线，每个blockcontainshashvalue（Hash）ofthepreviousBlock，fromthecreationblock（GenesisBlock）toConnectTothecurrentBlock，formingablock，fromthecreationblock（GenesisBlock）。
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