Advancing Blockchain Scalability: An Introduction to Layer 1 and Layer 2 Solutions

TL;DR

This paper reviews Layer 1 and Layer 2 scalability solutions for blockchain, highlighting how Layer 2 protocols like rollups and channels significantly improve transaction throughput and efficiency over Layer 1 enhancements.

Contribution

It provides a comprehensive analysis of Layer 1 and Layer 2 scaling methods, emphasizing the advantages of Layer 2 protocols in enhancing blockchain performance.

Findings

Layer 2 protocols outperform Layer 1 in transaction throughput

Layer 1 improvements face inherent limitations due to storage costs and latency

Layer 2 techniques like rollups and channels are effective scalability solutions

Abstract

Bitcoin rise has put blockchain technology into the mainstream, amplifying its potential and broad utility. While Bitcoin has become incredibly famous, its transaction rate has not match such a corresponding increase. It still takes approximately 10 minutes to mine a block and add it to the chain. This limitation highlights the importance of seeking scale-up solutions that solve the low throughput transaction rates. Blockchain's consensus mechanisms make peer-to-peer transactions becomes feasible and effectively eliminate the need for centralized control. However, the decentralized systems also causes a lower speed and throughput compared to centralized networks as we mentioned Bitcoin's block creation rates. Two mainstreams scale-up solutions, Layer 1 scale-up and Layer 2 scale-up have been implemented to address these issues. Layer 1 level scalability enhancements happen at where traditional blockchain operates. This paper provides a deep examination of the components of the Layer 1 protocol and the scale-up methods that directly improve the lower level blockchain. We also address that Layer 1 solutions encounter inherent limitations although improvements were applied due to layer 1 storage costs and latency are high. In addition, we discuss layer 2 protocols, advanced scalability techniques, that elevate blockchain performance by handling transactions off the mainnet. Our findings indicate that Layer 2 protocols, with their various implementations such as rollups and channels, significantly outperform Layer 1 solutions in terms of transaction throughput and efficiency. This paper discusses these Layer 2 scaling methods in detail, aiming to provide readers with a comprehensive understanding of these protocols and the underlying logic that drives their effectiveness.