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Top Rollups tokens by market capitalization

Rollups contains 12 coins with a total market capitalization of $11.15B and an average price change of +2.52%. They are listed in size by market capitalization.

Rollups are a blockchain scaling solution designed to boost throughput by aggregating multiple transactions into one. By processing numerous transactions off-chain and then submitting a consolidated version or proof to the main chain, they alleviate congestion, enabling higher transaction volumes and reduced fees. There are two primary types: Optimistic Rollups, which assume transactions are valid until challenged, and zk-Rollups, which utilize cryptographic proofs called zk-SNARKs to confirm transaction validity. By enhancing scalability without compromising security, rollups are increasingly seen as a pivotal element in the evolution of blockchain technology, especially for platforms like Ethereum facing capacity constraints.

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What are the main types of rollups?

The two primary types of rollups are Optimistic Rollups and zk-Rollups. Optimistic Rollups assume transactions are valid unless proven otherwise and utilize a challenge period during which invalid transactions can be contested. zk-Rollups use cryptographic techniques called zk-SNARKs to batch multiple transactions into a single proof, allowing the main chain to verify transactions without processing each one individually.

How do rollups differ from sidechains?

While both rollups and sidechains aim to scale blockchains, they differ in their approach and security models. Rollups bundle multiple transactions off-chain but eventually settle them on the main chain, inheriting its security. Sidechains, on the other hand, operate as separate blockchains with their own consensus mechanisms and may have different security assumptions than the main chain.

How do rollups contribute to reduced transaction fees?

By batching multiple transactions off-chain and submitting them as one transaction or proof to the main chain, rollups decrease the on-chain data load. This reduces the computational work required by nodes to validate transactions, leading to a drop in overall network fees.

Are there any challenges or drawbacks to using rollups?

Yes, implementing rollups introduces complexities due to advanced cryptographic techniques, potentially exposing new vulnerabilities. Additionally, for Optimistic Rollups, there's a delay caused by the challenge period, which might not suit all applications. Successful adoption also depends on integration by developers and acceptance by users, and migrating existing applications to rollups might pose challenges.

How do rollups ensure security and trustworthiness?

Rollups ensure security by leveraging the underlying security of the main chain. Transactions, although processed off-chain, are still anchored to the main chain, either through cryptographic proofs (as in zk-Rollups) or by the challenge mechanism (in Optimistic Rollups). This means that any malicious or erroneous activity can be detected and rectified based on the main chain's established security protocols.

Can all dApps (decentralized applications) be migrated to use rollups?

While many dApps can benefit from migrating to rollups for scalability reasons, not all might find it straightforward. The feasibility depends on the dApp's complexity, the nature of its transactions, and the specific rollup solution. For instance, dApps requiring instant finality might face challenges with Optimistic Rollups due to the challenge period.

Are rollups only relevant to Ethereum, or can they be implemented on other blockchains?

While rollups have gained significant attention in the Ethereum community due to its pressing scalability concerns, the concept is not exclusive to Ethereum. Any blockchain facing scalability issues can explore rollups as a potential solution, provided that the architecture and security models are compatible.