Electronic　tickets　(e-tickets)　are　gradually　being　adopted　as　a　substitute　for　paper-based　tickets　to　bring　convenience　to　customers,　corporations,　and　governments.　However,　their　adoption　faces　a　number　of　practical　challenges,　such　as　flexibility,　privacy,　secure　storage,　and　inability　to　deploy　on　IoT　devices　such　as　smartphones.　These　concerns　motivate　the　current　research　on　e-ticket　systems,　which　seeks　to　ensure　the　unforgeability　and　authenticity　of　e-tickets　while　simultaneously　protecting　user　privacy.　Many　existing　schemes　cannot　fully　satisfy　all　these　requirements.　To　improve　on　the　current　state-of-the-art　solutions,　this　paper　constructs　a　blockchain-enhanced　privacy-preserving　e-ticket　system　for　IoT　devices,　dubbed　PriTKT,　which　is　based　on　blockchain,　structure-preserving　signatures　(SPS),　unlinkable　redactable　signatures　(URS),　and　zero-knowledge　proofs　(ZKP).　It　supports　flexible　policy-based　ticket　purchasing　and　ensures　user　unlinkability.　According　to　the　data　minimization　and　revealing　principle　of　GDPR,　PriTKT　empowers　users　to　selectively　disclose　subsets　of　(necessary)　attributes　to　sellers　as　long　as　the　disclosed　attributes　satisfy　ticket　purchasing　policies.　In　addition,　benefiting　from　the　decentralization　and　immutability　of　blockchain,　effective　detection　and　efficient　tracing　of　double　spending　of　e-tickets　are　supported　in　PriTKT.　Considering　the　impracticality　of　existing　e-tickets　schemes　with　burdensome　ZKPs,　we　replace　them　with　URS/SPS　or　efficient　ZKP　to　significantly　improve　the　efficiency　of　ticket　issuing　and　make　it　suitable　for　use　on　smartphones.