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Ethereums censorship problem seems to have changed course over the past six months. After the government's Office of Foreign Asset Control sanctioned Tornado Cash transactions to U.S. citizens in August, the vast majority of blocks added to the blockchain were OFAC compliant.

Now, the share of censored blocks has shrunk to less than a third in what might be seen as a comeback for Ethereums anti-censorship ethos.

According to the site MEV Watch, during the past weekend and into the beginning of this week, roughly one in three blocks that made it onto the Ethereum blockchain was OFAC compliant. This means that about 30% of blocks excluded transactions sanctioned by the OFAC, including Tornado Cash.

Flipping that around, more than two-thirds of blocks that made it onto the Ethereum blockchain over the last 24 hours are not OFAC compliant.

Since Ethereum went through the Merge in September, about 85% of the blocks that made it onto the blockchain participated in a middleware known as MEV-Boost, where validators can request pre-made blocks from builders.

MEV-Boost is a software that helps validators earn MEV, or maximal extractible value, which are profits that come from rearranging or including certain transactions within a block. The MEV-Boost software was innovated by Ethereum research and development team Flashbots in order to distribute MEV among validators more equally.

While MEV-Boost hasnt been integrated into Ethereum at the protocol level, its widely used by the Ethereum ecosystem, as 85% of validators have relayed blocks via the middleware component. Flashbots also has its own relayer for validators to connect with, used by roughly 25% of validators.

After OFAC sanctioned Tornado Cash, there was debate over whether validators should include those transactions or not. Ever since then, the Ethereum community has continued to push for a censorship reversal, and the results of those efforts now appear to be paying off thanks, in large part, to the introduction of new, non-censoring relays.

At the time the sanctions went into effect, most validators were connected to Flashbots MEV-Boost relay, which Flashbots immediately programmed to censor transactions by default.

In response to community backlash, however, Flashbots raced to complete the process of open sourcing its code for MEV-Boost, so others could develop their own non-censoring relays.

In November, Agnostic and ultra sound relays with a non-censoring version of MEV-Boost were introduced. Since then, they have risen up in the ranks of relays delivering blocks on Ethereum. Flashbots accounts for delivering about 26% of the blocks over the past 14 days, while Agnostic and ultra sound each have delivered roughly 20% of the blocks over the past 14 days.

Over the weekend, Agnostic and ultra sound each delivered more blocks on Ethereum than Flashbots did.

Martin Kppelmann, co-founder of Gnosis Chain, which runs the Agnostic relay, told CoinDesk that it took some time to get the word out and demonstrate that we offer a reliable relay.

Now that validators have had the opportunity to experiment with MEV-Boost, many have started to turn to alternative relays like Agnostic and ultra sound.

The number of validators that are connected to us is constantly growing, Kppelmann said. We were already able to deliver the most blocks of all relays for some period of time.

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Latest Ethereum Blocks Suggest Validators Are Reversing Censorship - CoinDesk