Doug, the sound of this is interesting, but it seems to be a lot harder than it might need to be, not to mention the pitfalls of being assigned emojis one wouldn’t want representing them in addition or the centralized nature of the provisioning source.
It also sounds very much like Kevin Marks’ Distributed Verification scheme using the rel=”me” attribute on web pages for which he built a chrome browser extension to actually implement it. Kevin also recently reported that Mastodon now actually supports this verification scheme in one of their most recent updates which should be used by instances that are regularly updating. The benefit is that this scheme already exists, is relatively well supported, there are parsers available for it, and it’s actually working on the open web. It’s also truly distributed in that it doesn’t rely on any central provisioning authorities that require ongoing maintenance or which could provide a monopoly on such a service.