Layer-2 scaling solutions have transformed Ethereum into a transactional powerhouse, a blockchain capable of supporting countless lending protocols, DEXs, and RWA ventures. But while the popularization of solutions like optimistic rollups have enabled fast, cheap transactions, it would be wrong to think that the mission is complete.
Although the L2 space has greatly matured in recent years, with optimistic rollups by far the most common scaling technology, developers continue to face sluggish dispute resolution, fraud risk, and high validator costs as the price of doing business.
Of course, just as life is lived forward but understood backwards, technology advances as builders review the recent past to craft solutions for tomorrow’s problems. So it is that rollups – which were developed to lighten the load on Ethereum’s base layer – have their own solutions promising to enhance speed, security, and accessibility.
Challenges facing developers
Clearly, optimistic and ZK rollups have been a boon for developers and the wider Ethereum ecosystem as a whole. But that’s not to say they don’t throw up their own challenges.
In the case of the former, the most notable frustration is the fact that withdrawals can be delayed for up to seven days due to the fraud-proving window, during which anyone can contest the accuracy of a transaction batch.
This protracted dispute resolution period is considered a worthwhile tradeoff, particularly since a single participant submitting a fraud proof is able to thwart the mendacious efforts of those seeking to conduct a Sybil attack.
Optimistic rollups are commonly known for their high collateral requirements, with an ETH bond in place to ensure the integrity of the system. If an invalid block is posted, the deposit is immediately slashed.
Speaking of posting blocks, optimistic rollup devs also contend with higher gas costs for submitting data to the base layer.
Enhancing rollup security and efficiency
Through Dave, which is based on the Permissionless Refereed Tournaments primitive and conceived as a public good, anyone with basic hardware and modest collateral can challenge fraudulent computations. This design prevents attackers from successfully flooding the system with fake identities.
Disputes are typically resolved in a single challenge period. Even in an extreme and highly adversarial scenario, the maximum delay an attacker could theoretically introduce is four weeks, and only by committing an absurd amount of capital. To be precise, assuming a bond value of 3 ETH, a Sybil attack on the order of 1 billion ETH would be required to sustain such a delay.
In practice, this makes Sybil attacks exponentially more expensive for the attacker than the resources required by the honest challenger. The result is a system that resolves fraud quickly, maintains open participation and remains economically secure without relying on expensive bonds or permissioned validator lists.
Community and developer impact
By foregoing steep financial stakes and keeping access permissionless, solutions like Cartesi’s Dave broaden the accessibility of fraud-proofing, opening it out to developers, validators, and indeed any user with a stake (ideological, not financial) in the health of the blockchain ecosystem.
Aside from lowering the barrier to entry for validators and auditors through Dave’s implementation, Cartesi sets the scene for the creation of highly secure and complex decentralized applications (dApps). That’s because dApps can be built using mainstream programming languages and software (including Python, C++, and Rust) within a Linux operating system running inside the Cartesi Virtual Machine.
The arrival of permissionless fraud-proofing has empowered blockchain developers to erect a ring of steel around rollups, making them faster, safer, and more reliable. With Layer-2s securing tens of billions worth of value, this fact should reassure users that Ethereum’s in rude health as we push into 2026 and beyond.
