Solana

Solana is a single-chain, high-throughput blockchain that pairs proof of stake with proof of history — a verifiable clock that orders transactions before validators vote on them. The design targets performance at the base layer rather than pushing activity onto rollups, and every trade-off follows from that decision.

Proof of history removes a coordination cost

In most consensus designs, validators must communicate to agree on the order of events, and that messaging is the bottleneck. Solana timestamps transactions into a verifiable sequence first, so nodes agree on ordering without a round of negotiation. Consensus then confirms a sequence that is already established.

Parallel execution is the other half

Transactions declare in advance which accounts they will read and write, so the runtime can execute non-overlapping transactions simultaneously. Chains that process strictly one at a time cannot do this. It is the reason throughput is high and the reason developers must think about account contention in a way they do not elsewhere.

Fees are low and priced in two parts

A small base fee applies to every transaction, with an optional priority fee bidding for faster inclusion during congestion. Low fees make applications viable that are simply uneconomic on more expensive chains — high-frequency trading, consumer payments, on-chain order books — and they also make spam cheap, which is a recurring operational pressure.

Hardware requirements concentrate validation

Keeping up with the chain demands substantially more bandwidth, storage and compute than most networks require. That raises the practical floor for running a validator and concentrates participation among operators who can afford the infrastructure — a real decentralisation cost, and the direct price of the performance.

The outage record belongs in any assessment

Solana has halted or degraded on several occasions, generally under load or from bugs triggered by unusual transaction patterns, requiring coordinated validator restarts. Reliability has improved substantially and the history is part of the risk profile. A network with no external fallback layer has to be right on its own.