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P4 (Programming Protocol-Independent Packet Processors) represents a paradigm shift in network programmability by providing a high-level language to define packet processing behavior in network switches/devices. The importance of P4 lies in its ability to overcome the limitations of OpenFlow, the previous de facto standard for software-defined networking (SDN). Unlike OpenFlow, which operates on fixed match-action tables, P4 offers an approach where network operators can define packet processing behaviors at various protocol layers. P4 provides a programmable platform to create and implement custom network switches/devices protocols. However, this opens a new attack surface for threat actors who can access P4-enabled switches/devices and manipulate custom protocols for malicious purposes. Attackers can craft malicious packets to exploit protocol-specific vulnerabilities in these network devices. This ongoing research work proposes a blockchain-based model to secure P4 custom protocols. The model leverages the blockchain’s immutability, tamperproof ability, distributed consensus for protocol governance, and auditing to guarantee the transparency, security, and integrity of custom protocols defined in P4 programmable switches. The protocols are recorded as transactions and stored on the blockchain network. The model's performance will be evaluated using execution time in overhead computation, false positive rate, and network scalability.