Also, how do you respond to the inevitable criticism that advertising your solution as a "shared global registry" invokes the "How Standards Proliferate" XKCD[1]?
Finally, I like the idea of creating a marketplace or exchange for AI training information, but it's strictly not necessary to use a blockchain for this purpose unless a very large portion of your users are hyper-concerned about their anonymity. It's also misleading to try to build a marketplace of signed IoT data, with the assumption that it is more trustworthy than unsigned IoT data, when that is simply false.