On October 6, Eduardo Antuña, a core team member of the Ethereum Economic Zone (EEZ), posted online to announce that the first cross-chain atomic transaction between the Ethereum mainnet and layer two expansion was officially completed (see reference link at the end).

What does "atomic transaction" mean here?

It refers to a transaction that either succeeds or fails, with no uncertain state in between.

Previously, such transactions could only occur within homogeneous networks, that is, either on the mainnet or on layer two expansions, and could not occur between heterogeneous networks, like this transaction involving both the mainnet and layer two expansions.

However, this transaction technically achieved the latter.

In theory, this implementation could also be expanded to cross-chain transactions between any layer two networks within the Ethereum ecosystem, such as using the mainnet as an intermediary to realize L2 -> mainnet -> L2 cross-chain, or reclaiming transaction ordering power, etc.

The ultimate goal is to enable a transaction within the entire Ethereum ecosystem to disregard the starting and destination points, achieving any cross-chain within the ecosystem (L1 ↔ L2, L2 ↔ L2), as if all transactions occur within a homogeneous network, preventing users from feeling network differences.

Subsequent evolutions are merely a matter of engineering implementation and time; they are no longer obstacles or roadblocks.

This transaction took 13-15 minutes to officially complete (achieving final certainty), and the transaction information is public (non-private).

Although this transaction still has significant shortcomings in performance (too slow) and privacy (no privacy), it has achieved a historic advancement in technical prototypes:

It technically enables an application to utilize resources from any network (mainnet and any layer two expansion) across the entire Ethereum ecosystem.

Specifically in the DeFi field, an application can use liquidity from both the mainnet and layer two expansions.

This fundamentally resolves the current fragmentation and isolation issue of liquidity between the mainnet and layer two expansions within the Ethereum ecosystem, making the Ethereum ecosystem truly a whole rather than a collection of fragmented "lords."

In fact, this transaction holds another significant meaning in addition to the above.

In a recent article, I responded to a reader's comment regarding the issue that Ethereum currently does not benefit from the ecological prosperity of layer two expansions.

I believe the ultimate possibility of solving this issue is for individual layer two expansions to thrive significantly, with a large number of all layer two expansions. But to achieve this, there is a crucial condition:

That is, these layer two expansions, as they develop, find they cannot leave the Ethereum ecosystem and must increasingly depend on it.

Once this condition is met, Ethereum could even forcibly take away a portion of the benefits from layer two expansions (such as reclaiming transaction ordering power, etc.) under "duress."

To satisfy this condition, the Ethereum ecosystem needs to genuinely become a seamless, freely flowing whole in terms of liquidity, transaction cross-chain, and mutual resource use.

Now, the transaction mentioned above has realized this condition in a technical prototype.

As for the current technical shortcomings of the transaction (slow performance, no privacy), they can ultimately be resolved.

Therefore, it is not an exaggeration to say that many articles online view this transaction as historically significant from this perspective.

According to the current path and pace, Ethereum is clearly and decisively marching towards the direction of the future foundational world.

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