AIxBlock is a decentralized, open-source AI infrastructure platform that enables developers, startups, and enterprises to build, fine-tune, and deploy AI models using distributed GPU resources. It supports full-stack AI development and workflow automation while preserving privacy, eliminating vendor lock-in, and reducing compute costs by up to 90%. Blockchain underpins coordination, contributor rewards, and transparent governance. With a global contributor model and expansion into underutilized EU data centers, AIxBlock empowers modular, scalable, and sustainable AI innovation across a decentralized marketplace of models, datasets, and compute.