As　an　emerging　distributed　ledger　technology,　blockchain　provides　multi-party　trust　between　unreliable　devices　to　share　data　and　resources　cooperatively,　which　facilitates　the　Internet　of　Vehicles　(IoV)　applications.　In　the　typical　blockchain　enabled　IoV　(BIoV)　scenarios,　based　on　the　data　of　common　interest　collected　by　various　sensors,　the　IoV　devices　jointly　maintain　the　world　state　in　the　form　of　address-balance　pairs　as　the　proof　for　transaction　issuing　and　validation,　where　Ethereum　like　blockchain　is　used　as　the　finite-state　machine　driven　by　the　transactions.　However,　with　the　extension　of　the　IoV　network,　an　enormous　number　of　accounts　leads　to　the　explosive　growth　of　the　state　data,　which　has　been　the　main　challenge　for　BIoV　with　resource-limited　devices.　This　paper　proposes　a　modular-based　adaptive　bit-width　compression　(ABC)　scheme　to　reduce　the　state　data　storage　on　each　device　by　representing　the　address　as　a　remainder　with　a　shorter　bit-width.　Besides,　a　new　transaction　validation　method　is　designed　with　the　support　of　the　XOR　filter,　which　guarantees　that　the　core　functions　of　the　blockchain　can　still　be　performed　normally　with　the　proposed　scheme　applied.　Theoretical　analysis　and　simulation　results　show　that　the　compression　ratio　for　the　address　data　could　be　more　than　80%,　which　dramatically　improves　the　scalability　of　BIoV　system.　In　addition,　the　extra　privacy-preserving　property　is　introduced　with　the　compression　scheme　because　the　account　information　is　unrecoverable　from　the　remainders.　IEEE