There’s been lots of interesting commentary on the Arbitrum timeboost proposal. Let’s talk about why timeboost is the right fit for Arbitrum. 🧵 Arbitrum sequences differently than other L2s, a key to its success. Pipelines sequencing & block building, so multiple blocks can be under construction at the same time. This is faster than the alternative that builds a block, publishes it, and waits for txs for the next block.

There’s been a bunch of chatter on here lately about the history of Arbitrum-like systems. I don’t want to get drawn into an argument, but I feel I need to set the record straight. Here are some facts. Thread: In 2014 my students at Princeton built an L2 based on interactive fraud proofs over programs compiled to ARM machine code. There’s a video on YouTube of the students talking about it. They didn’t build on Ethereum because it didn’t exist yet.

CNN reports that officials plan to issue "vaccination cards" to people who get COVID vaccines. We need to be careful about how that is done. Some of the strategies are counterintuitive. Thread: Vaccination cards can have two possible purposes: certificate or reminder. A certificate lets you prove to a third party that you have been vaccinated. A reminder just helps you remember when you were vaccinated and whether/when you need new doses.

Some perspective on the Iowa vote tabulation app: This is far from the worst that could have happened. Results will be tabulated correctly, if a bit more slowly than news junkies preferred. The key to securing elections is resilience. 1/6 Adding up votes across precincts is the easiest part of the election to secure. There's ample public evidence of what happened in each precinct. The rest is just arithmetic. Tabulation errors have been found and fixed in manual systems before. No big deal; be patient. 2/6