This study is one of the first to explore how blockchain technology (BCT) could be used to improve food security in communities that are reliant on agriculture but are the last to receive services or access to markets, known as the ‘last-mile’. The goal was to determine how BCT could contribute to improving the income of African indigenous vegetable (AIV) value chain actors (e.g., producers, traders, and retailers) and to the affordability, availability, and accessibility of nutritious foods like AIVs for consumers. It finds that BCT can simultaneously strengthen the functionality of an entire agri-food value chain by increasing the efficiency of transactions among value chain actors, improving cooperation along the value chain, and enhancing access to information. A decrease in post-harvest loss, reduction in negotiation and search costs, and traceability of Grade A vegetables were facilitated by the blockchain functionality of the AgUnity V3 SuperApp. Producer income was improved by better meeting market demand, time savings on AIV activities, increasing the supply of Grade A vegetables, and making information on the vegetables more available to consumers. Increased incomes led to improved food security among producers by facilitating their ability to procure more food, especially higher quality proteins and fruits. Participants and consumers reported an increase in the consumption of AIVs over the study period because of increased quality, availability, and awareness of their nutritional importance.