• Vitalik Buterin says synchronous atomic composability is highly overrated.

  • Buterin does not see the implementation as a crucial feature for cross-L2 transactions.

  • The Ethereum co-founder highlighted users’ most crucial interests in L2 features.

Ethereum co-founder Vitalik Buterin argues that synchronous atomic composability is highly overrated. Buterin stated this in a recent post on X (formerly Twitter), highlighting that it is not among the most crucial features desired by crypto users for cross-L2 transactions.

Synchronous atomic composability is very overrated imo. Like, think about what are some specific cross-L2 things *you* are already doing or envision yourself doing that could be more seamless. For me, the top two are:1. I have coins on Optimism, I want to pay Bob, but Bob is…

— vitalik.eth (@VitalikButerin) June 19, 2024

According to Buterin, crypto users’ fundamental L2 features include the ability to make cross-chain payments and to send coins across blockchains when using dApps from a different chain. The blockchain expert described these issues as practical UX issues that synchrony cannot solve.

Addressing these as UX problems, Buterin explained how blockchain developers can remedy the fundamental issues he identified. The Ethereum co-founder proposed widespread adoption of the ERC-3770 token standard. He noted it would allow the chain to be part of the address, making an address a self-contained “how do you pay me” identifier.

Buterin also suggested addressing the issue with a cross-L2 exchange protocol, like the ERC-7683, so that users can execute cross-chain sends programmatically without needing to determine which specific intermediaries to trust and which APIs to connect to. He also identified a wallet integration solution where sending cross-L2 is done by putting the recipient’s ERC-3770 address into the same text box used for regular sends.

Meanwhile, Buterin also noted that solving technical problems can make the overall solution much more efficient, especially by making cross-chain swap markets more accessible to liquidity providers. He cited improvements that have reduced withdrawal times from one week, as seen with optimistic rollups, to one hour for ZK rollups today, to one slot in ideal ZK-rollups with proof aggregation. However, he thinks there are significant unclaimed gains that do not require achieving synchrony.

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