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Foundations · easy

1. What is Solana?

High-throughput, low-latency execution and Proof of History.

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Solana is a high-performance Layer 1 blockchain designed for mass adoption. Unlike the EVM's global state machine, Solana uses Proof of History (PoH) as a cryptographic clock to order transactions before consensus, allowing parallel transaction execution via the Sealevel runtime.

Programs on Solana are stateless: all user state, balances, and data live inside dedicated accounts passed to the program at runtime.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. What is Proof of History (PoH) in Solana?

  2. 2. Are Solana smart contracts (programs) stateful or stateless?

  3. 3. What is the parallel execution engine of Solana called?

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