What Is The Term For Processing Transactions In Layer 2 And Periodically Recording The Proofs On The Decentralized Main Network?

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  • Feb 22, 2024

What Is the Term for Processing Transactions in Layer 2 and Periodically Recording the Proofs on the Decentralized Main Network?

In the realm of blockchain technology, the concept of Layer 2 (L2) solutions has emerged as a means to address the scalability limitations of decentralized networks. L2 solutions operate on a separate layer, parallel to the main blockchain, enabling faster and cheaper transactions while maintaining the security and immutability of the underlying network.

One key aspect of L2 solutions is the mechanism used to record the validity of transactions processed on the L2 network onto the main blockchain. This process, known as rollup, involves periodically aggregating and summarizing the transactions into a single proof, which is then submitted to the main network for verification and inclusion in the blockchain.

Rollup is a collective term that encompasses two main types of rollup mechanisms:

  1. Optimistic Rollup: This mechanism assumes that all transactions processed on the L2 network are valid. The proof submitted to the main network contains a challenge period, during which anyone can dispute the validity of a transaction. If a dispute is raised, the transaction is reverted, and the submitter of the proof is penalized.
  2. Zero-Knowledge Rollup (ZK-Rollup): This mechanism utilizes advanced cryptography to generate a succinct proof that all transactions in a batch are valid. The proof is much smaller than the actual transactions, making it more efficient to verify on the main network. ZK-Rollups provide stronger security guarantees than optimistic rollups, as they do not rely on a challenge period.

Facts in South Africa

South Africa has a growing blockchain ecosystem, with several initiatives exploring the use of L2 solutions. Here are some notable facts:

  • Standard Bank: South Africa’s largest bank has partnered with Polygon to develop an L2 solution for cross-border payments.
  • Centurion: A South African fintech company is utilizing the Optimistic Rollup mechanism to build a scalable payment platform.
  • Luno: A popular cryptocurrency exchange in South Africa is exploring the integration of L2 solutions to enhance transaction speed and reduce fees.

Benefits of Rollup

The use of rollup in L2 solutions offers several benefits:

  • Scalability: Rollup significantly increases the transaction throughput of the main network by processing transactions off-chain.
  • Cost-Effectiveness: Transactions processed on L2 networks are typically much cheaper than on the main network, as they do not require the same level of computational resources.
  • Security: The validity of transactions is ultimately recorded on the main blockchain, ensuring the same level of security as the underlying network.
  • Decentralization: L2 solutions maintain the decentralized nature of the main network, as the proofs submitted for verification are validated by multiple nodes.


While rollup offers significant advantages, it also faces some challenges:

  • Complexity: The implementation and maintenance of L2 solutions can be complex, requiring specialized technical expertise.
  • Interoperability: Different L2 solutions may use different protocols, making it challenging to transfer assets and data between them.
  • Centralization: Some L2 solutions may introduce a degree of centralization, as they rely on a limited number of entities to generate and submit proofs.


The term for processing transactions in Layer 2 and periodically recording the proofs on the decentralized main network is rollup. Rollup is a key mechanism that enables L2 solutions to achieve scalability, cost-effectiveness, and security. While L2 solutions have the potential to revolutionize blockchain technology, they also face challenges related to complexity, interoperability, and centralization. As the blockchain ecosystem continues to evolve, it is likely that rollup will play an increasingly important role in addressing the scalability limitations of decentralized networks.