The ‘Purge’ — Vitalik’s plan to reduce Ethereum’s bloat

Vitalik Buterin, co-founder of Ethereum, has released the fifth part of his blog series “The Purge,” aimed at reducing data bloat and simplifying Ethereum’s protocol.

The Purge focuses on trimming unnecessary data storage and eliminating outdated features to make Ethereum more efficient while preserving “the permanence” of the blockchain.

The Purge is not set to directly impact Ethereum’s gas fees. However, the proposed changes may enhance network performance and reduce operating costs.

The Purge roadmap showing the plan to simplify the protocol and eliminate technical debt. Source: vitalik.eth

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Reducing storage for better node operations

A key element of The Purge is to tackle the increasing barrier new nodes face when seeking to join the Ethereum network, increasing storage requirements.

A fully-synced Ethereum node currently requires over 1.17 terabytes (TB) of storage — primarily due to historical data, according to ycharts data.

Buterin’s Purge initiative discusses the aim of cutting client storage requirements “by reducing or removing the need for every node” to permanently store all history.

“…and perhaps eventually even state.”

Chart depicting the current data required for full sync on the Ethereum network. Source: ycharts

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State expiry

Buterin’s post highlights the current state of the network, revealing that any new state data created is stored forever, resulting in the state expanding continuously.

“State is much harder to ‘expire’ than history, because the EVM is fundamentally designed around an assumption that once a state object is created, it will always be there and can be read by any transaction at any time.”

Put in layman’s terms, any new data added to the network stays there permanently, causing the to grow, but Buterin seeks to counter this through “partial state expiry.”

This new idea would involve less frequently accessed state data being expired and revived later via cryptographic proofs when required.

Related: Too early to say Ethereum L2s are ‘cannibalistic’ of revenue: Sygnum Bank

Move toward stateless verification

Buterin’s Purge blog post follows the introduction of The Verge on Oct. 23, designed to make running a node on the Ethereum network more secure and accessible.

The Verge upgrade aims to decrease hardware requirements for blockchain block verification without storing large amounts of data through “stateless verification.”

This new verification method could “make fully-verifying the chain so computationally affordable that every mobile wallet, browser wallet, and even smart watch” can run a node on the network.

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