Why does the Ethereum contract size limit exist? Vitalik interprets the technical upgrade roadmap.

2025-12-23 12:56:11

[Block Rhythm] What is the contract size limit of Ethereum really about? Vitalik recently revealed the truth in the community—it's mainly to defend against DoS attack risks.

In simple terms, the current limit for the size of a single contract on Ethereum is about 82KB (calculated by the cost of creating per byte), which seems a bit “tight”. However, the good news is that once Ethereum upgrades its state structure to a unified binary tree (EIP-7864), the limit on contract size is expected to be completely eliminated, theoretically allowing for the release of super large contracts.

But there is a side effect to deal with here - the Gas fees and mechanism design when super large contracts go on-chain. It's not just a matter of simply opening it up; it also requires careful weighing of the balance between creation costs and network health. Therefore, while the direction of this technological upgrade is clear, there are still many engineering problems in the details that need to be tackled one by one.

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MetaverseLandlord

· 2025-12-26 11:30

The 82KB limit is really unsustainable; I need to upgrade quickly.

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ChainWallflower

· 2025-12-26 08:59

The 82KB limit indeed causes bottlenecks, but loosening it can't be done recklessly. We still need to guard against DoS attacks.

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ServantOfSatoshi

· 2025-12-23 13:26

The 82KB limit should have been broken a long time ago. Writing complex logic just hits the ceiling, it's so annoying.

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Anon32942

· 2025-12-23 13:18

82KB is really too much, no wonder so many people are complaining about the contract not being able to be issued. When the super large contract actually comes, I don't know how high the Gas will soar... Vitalik is right, but executing it will probably involve a lot of compromises.

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DogeBachelor