In　Cognitive　Radio　(CR)　networks　combined　with　Energy　Harvesting　(EH)　technology,　Secondary　Users　(SUs)　are　vulnerable　to　jamming　attacks　when　sensing　idle　channels.　At　the　same　time,　they　may　encounter　numerous　jamming　and　eavesdropping　attacks　during　the　data　transmission　phase.　This　paper　examines　the　scenario　in　which　SUs　are　susceptible　to　malicious　attacks　and　energy　constraints　in　both　the　sensing　and　transmission　phases.　We　propose　a　utility　function　applicable　to　a　single　time　slot.　The　blockchain　uses　Smart　Contract　(SC)　technology　to　set　rewards　and　punishments　for　users＇　channel　selection　behavior　and　adjust　mining　difficulty.　This　method　combines　blockchain　with　spectrum　sensing　data　fusion,　abandons　the　decision-making　mechanism　of　the　traditional　Cooperative　Spectrum　Sensing　(CSS)　Fusion　Center　(FC),　and　adopts　a　distributed　structure　to　ensure　the　security　and　reliability　of　sensing　data　fusion.　In　addition,　this　paper　uses　the　potential　game　and　the　Stackelberg　game　to　study　the　optimal　transmission　channel　and　optimal　time　slot　allocation　strategy　for　SUs　under　malicious　attacks.　Considering　the　possible　interference　caused　by　channel　switching　and　the　greedy　principle　of　Malicious　User　(MU),　the　proposed　two-layer　game　method　gradually　optimizes　the　sensing　detection　probability　and　secure　communication　rate　with　time　slot　iteration.　In　order　to　further　improve　the　secure　communication　rate,　an　iterative　update　formula　for　transmission　power　is　given　to　make　reasonable　use　of　the　remaining　energy　of　each　SU　at　the　end　of　each　time　slot.　Simulation　results　show　that　the　proposed　method　is　superior　to　traditional　methods　in　terms　of　sensing　performance　and　secure　communication　rate.　©　2013　IEEE.