Bitcoin had taught the world to keep a shared ledger, and Ethereum had taught it to run programs. But both moved at the pace of a committee: every computer had to stop and agree on when things happened before it could agree on what happened.

In November 2017, an engineer named Anatoly Yakovenko — after, as he tells it, two coffees and a beer, at four in the morning — had an idea. What if the blockchain carried its own clock? He called it proof of history, and the chain built around it became Solana.

In the 1990s, the thinker Nick Szabo coined the phrase smart contract, and compared it to a humble vending machine: put in the right coin, and the machine hands over your snack. No clerk. No argument.

Ethereum made smart contracts real in 2015. Solana calls them programs, usually written in Rust — and, thanks to a runtime called Sealevel, it runs many of them at the same time, like a row of vending machines that never queue behind one another.

Anatoly did not build it alone. His old colleagues from Qualcomm, Greg Fitzgerald and Stephen Akridge, joined him, and Raj Gokal came aboard to run the company. They first called it Loom, then renamed it in 2018 after Solana Beach, the California town where Anatoly and Greg had lived and surfed.

On 16 March 2020, as the world locked its doors, the mainnet beta went live. Its currency was called SOL, and a new slot was cut every few hundred milliseconds.

On Solana, fees are counted in lamports — one billionth of a SOL, named after Leslie Lamport, the computer scientist who described the Byzantine Generals we met in Chapter III. A simple transfer costs a small fraction of a cent.

Cheap and fast has a price of its own. In September 2021, a flood of trading bots overwhelmed the network and it halted for about seventeen hours; more outages followed. Then, in November 2022, the exchange FTX — one of Solana's loudest backers — collapsed, and SOL fell more than nine-tenths from its peak. Many wrote the chain's obituary.

Solana's secret is two rivers running together. One is the clock — proof of history, ticking out a verifiable order of events. The other is the vote — proof of stake, where validators lock up SOL as a promise of good behaviour and vote on each block through a protocol called Tower BFT.

Because everyone already agrees on the time, the votes can be quick: a new slot roughly every 400 milliseconds. In 2025, validators voted to adopt Alpenglow, a new consensus design aiming to make blocks final in a fraction of a second — the river, still learning to run faster.