A Different Approach to Scaling
While Ethereum scales horizontally by pushing activity to layer-2 rollups, Solana takes the opposite bet: keep everything on one chain and make that chain fast enough to handle global demand. In practice this means the entire state, all users and every application settle in the same execution environment.
This is called a monolithic architecture. The trade-off is that Solana validators must run more powerful hardware than Ethereum validators, which raises the bar for who can participate in securing the network. In exchange, users get sub-second finality and fees that are usually a fraction of a cent.
Proof of History and Parallel Execution
Solana’s core innovation is Proof of History (PoH) — a cryptographic clock that stamps the ordering of events before validators reach consensus about them. This eliminates a huge amount of the coordination overhead that slows traditional blockchains.
The runtime, called Sealevel, then executes non-conflicting transactions in parallel across CPU cores. Two swaps that touch different markets can settle at the same instant. This is fundamentally different from Ethereum, which processes transactions sequentially by design.
What People Actually Build on Solana
The combination of low fees and fast finality has attracted a specific class of applications. Consumer trading apps, meme markets and prediction markets have found product-market fit because users can act on impulses without being taxed by gas. On-chain limit-order books like Phoenix and OpenBook, which are economically impossible on Ethereum L1, work natively on Solana.