Would a truly distributed and more complete Git be feasible?

Since people are talking about migrating off Github, I was thinking about having a truly distributed code management/sharing platform.

Here's what I'm thinking (rough and mostly incorrect ideas):

- have a blockchain-like global repository where there's consensus over the code

- have a way of handling issues that's somehow built into git (e.g. having a .issues subfolder into the repository with append-only functionality, permissions, tags, etc.)

- a way to sign your code. AFAIK in git you can pretty much impersonate anyone, which is problematic

This is a rough idea, but it should be kind of doable. What do you think?