Ethereum

One important difference between shards and rollups that I did not get into is *upgradeability*: shards would upgrade their EVM automatically, rollups need their own governance. But could we change that? (thread)

One thing I didn't see addressed in your post is whether both shards and rollups can exist at the same time. E.g. could you not have rollups as currently set up and then also shards that work as you described as alternatives to L2?

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Probably doing stuff and things.

I thought an execution shard in the way vitalik described would be an alternative to a rollup - rollups don't need shards, just DA (blobs) to post data to afaik

if both existed simultaneously, a rollup would be deployed exclusively on a single shard. in the absence of efficient cross-shard comms, chaos will ensue for dApps, users, and their balances.