Introduction
Most engineers think blockchain is just about cryptography and distributed consensus. The real complexity lies in managing eventually consistent state across thousands of adversarial nodes while maintaining sub-second query performance.
The State Explosion Problem
Here’s what Bitcoin’s engineers discovered: storing every transaction forever creates a quadratic growth problem. With 500 million transactions, full nodes need 450GB of disk space. Ethereum hit this faster—their state trie grew to 800GB in just 6 years. The solution? Separate the execution layer from the data availability layer.
