The global cyberspace faces many cybersecurity challenges, including illegal changes to contract terms and loopholes in the smart contract framework itself. This study adopts the automatic execution and intelligence of digital contracts, uses public key infrastructure technology digital certificates to establish trust relationships, encrypts data, and improves network security; the distributed ledger adopts the Byzantine fault-tolerant algorithm to prevent data from being tampered with, solving the problems of low efficiency and low security of traditional cyberspace manual governance. The study shows that after 28 companies applied digital contracts in 2023, the average authenticity of the data was 50.95% higher than the average authenticity of the data in 2022, the average integrity of the data was 36.44% higher than the average integrity of the data in 2022, and the average security of the data was 110.22% higher than the average security of the data in 2022. The findings highlight the critical role of digital contract implementation in enhancing the security and operational efficiency of global cyberspace governance, offering an effective solution to address the complex challenges inherent in managing today’s interconnected digital environment.