Blockchain technology has emerged as a promising solution to address key challenges in public transport, such as interoperability, privacy and transaction transparency. Despite these advances, the lack of a unified platform for integrating different transport modes and the diversity of ticketing solutions across operators remain significant barriers to seamless collaboration and interoperability. This paper proposes a blockchain-based architecture for transaction verification and digital identity management in multimodal public transport systems. The approach ensures secure co-payment, reliable data validation and trust among diverse operators by leveraging private blockchain networks, where operators act as verification nodes through consensus-based transaction approval without a central authority. The system incorporates standardized data formats, advanced algorithms for operator data integration, and a comprehensive model for managing operators, assets, and transactions. To protect user privacy, Zero-Knowledge Proof (ZKP) techniques enable secure authentication without revealing sensitive information. This study shows how blockchain technology can improve interoperability, ensure fair revenue sharing, and provide a secure, decentralized infrastructure for efficient and privacy-preserving collaboration in public transport networks.