More　vehicles　are　connecting　to　the　Internet　of　Things　(IoT),　transforming　Vehicle　Ad　hoc　Networks　(VANETs)　into　the　Internet　of　Vehicles　(IoV),　providing　a　more　environmentally　friendly　and　safer　driving　experience.　Vehicular　announcement　networks　show　promise　in　vehicular　communication　applications.　However,　two　major　issues　arise　when　establishing　such　a　system.　First,　user　privacy　cannot　be　guaranteed　when　messages　are　forwarded　anonymously,　thus　the　reliability　of　these　messages　is　in　question.　Second,　users　often　lack　interest　in　responding　to　announcements.　To　address　these　problems,　we　introduce　a　Blockchain-based　incentive　announcement　system　called　PIAS.　This　system　enables　anonymous　message　commitment　in　a　semi-trusted　environment　and　encourages　witnesses　to　respond　to　requests　for　traffic　information.　Additionally,　PIAS　uses　blockchain　accounts　as　identities　to　participate　in　the　system　with　incentives,　ensuring　privacy　in　anonymous　announcements.　PIAS　successfully　protects　the　privacy　of　participants　and　motivates　witnesses　to　respond　to　requests.　Furthermore,　our　assessment　of　security　and　compatibility　shows　that　PIAS　can　maintain　privacy　and　incentivization　while　being　compatible　with　both　the　Bitcoin　and　Ethereum　blockchains.　Further　evaluation　has　confirmed　the　system＇s　efficiency　in　terms　of　performance.