Electronic　medical　records　(EMRs)　are　the　most　critical　data　in　human　health　management.　As　in　traditional　centralized　healthcare　service　systems　(HSSs),　user　privacy　security,　EMRs　data　leakage,　tampering,　and　island　are　some　significant　problems.　However,　blockchain　is　a　promising　technology　to　protect　the　privacy　and　realize　cross-institutional　data　sharing　for　solving　these　problems.　In　this　article,　a　novel　peer-to-peer　EMRs　data　management　and　trading　system　called　healthchain　has　been　proposed　based　on　consortium　blockchain　technology.　Through　this　distributed　system,　the　patient　can　access　their　EMRs　in　different　institutions　freely,　and　the　EMRs　can　be　traded　among　different　users　conveniently.　Then,　to　balance　EMRs　data　supply　and　demand,　we　establish　a　Stackelberg　pricing　model　to　evaluate　EMRs　data　providers　and　consumers＇　interactions.　The　optimal　unit　price　and　data　amounts　can　be　found　by　applying　the　backward　induction　method,　and　the　maximizing　benefits　of　the　participants　can　be　obtained　by　achieving　the　Nash　equilibrium　in　the　proposed　game.　Moreover,　security　analysis　shows　the　healthchain　can　provide　secure　EMRs　management　and　trading,　and　the　simulation　results　show　that　the　proposed　pricing　model　can　help　the　healthchain　achieve　social　welfare　maximization.　©　2014　IEEE.