[Blog post] IC internals: XNet protocol

TL;DR: IC internals: XNet protocol

I’m happy to announce the next post in the “IC internals” series.
A few people wanted to know more about the subnet communication protocol, so here it is!

Warning: the article is not beginner-friendly; it’s detailed enough to serve as onboarding material for new engineers in the Message Routing team. Still, I believe the XNet protocol is a marvelous feat of research and engineering that deserves to be covered in detail.

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