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Ed Felten

Apr 26 • 1 tweets • 1 min read • Read on X

On March 22, our Offchain Labs team disclosed privately two serious vulnerabilities in the Optimism fraud proof system. Details: medium.com/offchainlabs/s…

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Ed Felten

@EdFelten

Feb 1, 2022

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.

And every version of the current Arbitrum code base, since 2017, has also had interactive fraud proofs over stateful execution of code compiled to a non-EVM virtual machine. That approach wasn’t invented in 2021.

Read 9 tweets

Ed Felten

@EdFelten

Dec 3, 2020

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.

Certificates need to resist forgery, because there will be incentives, perhaps strong ones, to make false certificates. And those of course are dangerous. Reminders don't need to resist forgery--why would you try to trick yourself about your status?

Read 6 tweets

Ed Felten

@EdFelten

Feb 4, 2020

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

Every voter made their intentions clear, and the in-precinct count was low-tech and public. That's resilient. Of course it would have been harder if this were a secret-ballot election rather than public caucuses. Secret ballot rules out "raise hands and count" approach. 3/6

Read 7 tweets

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