Artificial Intelligence and Blockchain

We are now living in an era of technological change and the words “AI” and “blockchain” are overwhelming. According to my observation, there are two groups of people who are involving in startup with the technology of AI or blockchain. I know some knowledge of AI but little blockchain. So, I just wonder if there exists some applications which are built on both AI and blockchain techniques. If the answer is yes and what are they. If the answer is no and if there has a possibility to combination them. This is my first posts, thanks for your attention.