Contemporary · Crypto · Whitepaper

Solana: A New Architecture for a High Performance Blockchain

Anatoly Yakovenko · 2017

"Proof-of-History plus a fast runtime enables a high-throughput, low-latency blockchain."

The idea

One of the slowest parts of reaching consensus on a decentralized network is simply agreeing on the order in which transactions happened, since there's no central clock everyone can trust. Yakovenko's insight was to build a verifiable, decentralized clock directly into the protocol — Proof of History — so that nodes could cryptographically prove that a certain amount of time had passed and events happened in a specific order, without needing to constantly communicate back and forth with each other just to agree on timing. This dramatically cuts the communication overhead that normally limits how fast a blockchain can process transactions.

Why it works

The mechanism works by repeatedly hashing a value into itself millions of times in sequence — a process that is inherently sequential (you can't skip ahead or parallelize it, because each hash depends on the output of the one before it) but that anyone can quickly verify was actually computed in order, once done. This creates a trustworthy, decentralized timestamp: since generating the sequence takes real, unavoidable time, and verifying it is fast, the network gets a shared sense of 'when' something happened without needing nodes to negotiate about timing in real time. Combined with a fast execution runtime, this lets Solana process a very high volume of transactions per second compared to blockchains that must spend more time and communication on ordering consensus alone.

The takeaway — recall it first

Check your understanding

What problem does Solana's Proof of History primarily solve?

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