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27 November 2021
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Ethereum

Ethereum founder, Vitalik Buterin discusses storage requirements, significance of PBS

As Ethereum grows, so does its history – and the hard disk requirements for validators, whose wallets are hurting. During a Reddit AMA, Ethereum users spoke about dealing with past chain data and discussed ways to scale Ethereum L1. Meanwhile, founder Vitalik Buterin also added his take.

Time to rewrite history?

Buterin put forward two possible solutions to deal with Ethereum’s historical data. These included a one-time history expiry which would take place after the Merge, as well as a periodic history expiry with a shifting deadline, formally known as EIP-4444. He clarified that both solutions could be implemented.

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One user asked about proposer/builder separation (PBS). Buterin recently posted about this method which was meant to stop block proposers – or miners – from adding transactions to the block in a way that benefited them.

For his part, Buterin explained,

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“Statelessness + PBS would allow independent validators to run with basically no storage requirements. Only builders and light client servers would have storage requirements.”

Buterin cautioned that PBS was yet to be fully developed and tested. Even so, he spoke about the theft of maximal extractable value [MEV] and said,

“I personally think that we will have to have either PBS or state expiry eventually (or maybe both), and PBS is looking more realistic because it’s urgent for other reasons (MEV).”

Meanwhile, Ethereum Improvement Proposal-4444 deals with historical data in Ethereum clients. Old blocks on the Ethereum chain reportedly translate to more than 400 gigabytes of hard disk storage space. This means validators need to buy even larger disks. EIP-4444 suggested,

“Clients must stop serving historical headers, bodies, and receipts older than one year on the p2p layer. Clients may locally prune this historical data.”

One user in the AMA wasn’t sure that historical expiry would bring perks for the end-user. In response, Buterin said,

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“Running a node becomes cheaper. Alternatively, it could be used to justify a moderate gas limit increase, which would lower tx fees.”

Roll me up

Rollups have an important part to play in the Ethereum ecosystem, as they are the layer-two solution for scaling up transactions on the second-largest crypto by market cap. However, Reddit users wanted to know how rollups would access expired history and data.

Buterin assured the users and said,

“It’s very unrealistic for old data to disappear completely; there are far too many services that have an interest in ensuring its availability: block explorers, any major stakeholder in the ecosystem of the rollup, exchanges…”

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