Insights into Emerging Blockchain Scalability Approaches Through Layer-2 Solutions and Sharding Mechanisms for High Throughput Decentralised Systems

Abstract

Blockchain technology is a distributed ledger technology that facilitates secure, transparent and decentralised transaction management between peer-to-peer networks without relying on a centralized authority. Despite its potential across various domains, scalability is a primary limitation in the development and evolution of blockchain technology. While Layer-2 execution frameworks and adaptive sharding techniques have shown significant results in overcoming the scalability limitation in blockchain technology, these techniques have generally been studied and developed in isolation. This study presents a comprehensive review of recent blockchain scalability techniques by categorizing these techniques and analyzing their performance characteristics in a comparative manner. The study critically evaluates the techniques in terms of their architecture design, operational mechanisms and performance characteristics while considering the associated trade-offs in terms of computation overhead, storage replication, hardware dependency, scalability degradation for larger node sizes and practical validation. The key insights demonstrate significant heterogeneity in terms of scalability methodologies adopted and environments used for experimentations. Also, enhanced throughput and reduced latency are often coupled with increased architectural complexity. The study highlights the absence of a unified and modular scalability framework capable of coherently integrating execution-layer optimization and shard management. The analytical synthesis presented a framework for understanding existing scalability paradigms and their architectural challenges for decentralised blockchain environments.