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Native Rust · medium

21. Native Rust: Direct Lamport Transfers

Transferring native SOL between program-owned accounts.

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If both accounts are owned by the program, you can transfer SOL directly by mutating their lamports in memory without invoking the System Program:

rust
**from_account.try_borrow_mut_lamports()? -= amount;
**to_account.try_borrow_mut_lamports()? += amount;

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.
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Check your understanding

  1. 1. When is direct lamport mutation allowed without calling the System Program?

  2. 2. What happens if a program tries to debit lamports from an account owned by System Program without a CPI?

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