Blockchain Trilemma Tradeoff

The blockchain trilemma is the observation, popularised by Vitalik Buterin, that a network struggles to maximise decentralisation, security and scalability at the same time — pushing hard on one usually costs something on another. Raising throughput by requiring powerful, expensive nodes tends to shrink the number of people who can run one; keeping hardware requirements low keeps validation open to many but limits capacity. It is a design tension rather than a proven law, and much of modern blockchain research tries to soften it: rollups, data sampling and light clients all aim to add capacity without forcing every participant to process everything. When comparing chains, a useful habit is to ask which corner of the trilemma the design quietly traded away.