The trend of network violence and false information dissemination is getting faster and faster. This paper uses private key signature and public key verification to ensure the authenticity and integrity of digital contracts. The decentralization and invariance of blockchain technology can strengthen data protection and privacy protection, and it can solve the problem that traditional manual methods cannot effectively reduce network violence and false information dissemination. In terms of cyber violence, 128 netizens in City A experienced cyber bullying in 2021, and 52 netizens experienced cyber bullying in 2022. Compared with the number of people who experienced cyberbullying in 2021, the number of people who experienced cyberbullying in 2022 decreased by 59.38%. In terms of false information, the number of false advertising events in City A in 2022 decreased by 60% compared with 2021. This study highlights the positive role of digital contracts in mitigating internet violence and curbing the spread of false information, contributing to the creation of a safer, more trustworthy, and healthier online environment.