What is blockchain scalability? (Complete guide for beginners)

Blockchain technology provides an alternative to traditional centralized ledger systems by enabling secure and transparent transactions without relying on a single controlling authority. Its security is based on strong encryption and a decentralized network architecture, which prevent data tampering and censorship. 

Despite these advantages, blockchains face significant scalability and performance challenges that limit their ability to handle large transaction volumes efficiently. Limited transaction throughput and slower processing speeds — as compared to conventional Web 2.0 systems — hinder wider adoption of the technology in high-demand applications. 

In recent years, there's been a flurry of research and development to address blockchain scalability issues, particularly via modular architectures that separate the main blockchain layers — settlement, execution and data availability — into distinct components. 

While the best blockchains are still less scalable than the fastest Web 2.0 systems, this gap has been narrowing. The industry's focus is now on achieving scalability comparable to that of Web 2.0 systems, such as Visa's famed high-throughput network, without sacrificing security. 

In this article, we discuss the concept of blockchain scalability, explain its underlying issues and outline the primary techniques to improve it while still maintaining network integrity.