Decentralized Blockchain Framework for Efficient and Secure VNF Development

This paper tackles the challenges associated with large-scale network service development in Network Functions Virtualization (NFV). We first propose a comprehensive blockchain-based framework covering the Virtualized Network Function (VNF) development stage. Then, we introduce a credit value-based evaluation model, encompassing direct and indirect evaluation, to assess contractors' creditworthiness dynamically. Correspondingly, we design a credit evaluation algorithm for practical implementation. Meanwhile, we formulate the VNF development schedule risk as a two-layer distributed decision model and introduce a two-layer continuous domain ant colony optimization (TCACO). Furthermore, we introduce a trusted repository to establish a secure VNF delivery platform, providing integrity checks for VNF packages through blockchain. Extensive simulation experiments using ONAP and Ethereum confirm the effectiveness of the proposed mechanism. This paper contributes a comprehensive framework for managing VNF development risks and enhancing efficiency in the management of large-scale network function services.