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The agricultural sector in India is dominated by small and marginal farmers, who are vulnerable to income uncertainty, delayed payments, a lack of price transparency, and dependence on middlemen. Contract farming has been recognized as a means to reduce market uncertainty by ensuring assured markets and prices; however, the current implementations of contract farming are plagued with one-sided contracts, lack of enforcement, low trust levels, and poor awareness among farmers. These issues are further exacerbated in rural and developing environments, where access to timely information, legal certainty, and digital literacy are poor. This paper presents Kisan Bandhu, a digital platform enabled by AI and blockchain technology, to facilitate transparent, secure, and inclusive contract farming. The proposed platform combines district-level AI-powered crop advisory services, blockchain-secured smart contracts, and multilingual conversational interfaces to enable direct engagement between farmers and agri-businesses. The proposed solution is centered on low-cost implementation, legal soundness, and usability for small farmers. The system design, architecture, methodology, and application validity are presented to establish the viability of the proposed platform in real-world agricultural supply chains