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Execution / Illustrated lesson

Flash loans
A very large loan can exist for one transaction.

A flash loan supplies temporary liquidity inside a transaction. The borrower executes other actions before satisfying the lender’s repayment or permitted debt rules.

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  1. 01

    Borrow temporary liquidity

  2. 02

    Run the callback actions

  3. 03

    Repay or satisfy the lender’s rules

Illustrative sequence. This diagram is a teaching aid, not a captured transaction.

What to collect

  1. Lender and receiver call frames
  2. Assets received and returned
  3. Final balance changes and fees
Before drawing a conclusion

A flash loan can support legitimate arbitrage or liquidation. Borrowed volume is not the same as stolen value.

Test the idea

A transaction borrows 10 million and returns it with a fee. Is 10 million the loss?

Reveal the explanation

No. Calculate surviving changes for the affected parties and separate temporary principal from final outcomes.

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