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Gas · medium

21. Transient Storage (EIP-1153: TSTORE & TLOAD)

Cheap transaction-scoped storage.

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Introduced in the Cancun upgrade (Solidity 0.8.24+), transient storage via `tstore` and `tload` behaves like storage but is wiped completely at the end of the transaction. It costs only 100 gas per read/write, making reentrancy guards and ERC-20 approvals during complex atomic swaps significantly cheaper.

solidity
bytes32 constant REENTRANCY_SLOT = 0;

modifier nonReentrant() {
    assembly {
        if tload(REENTRANCY_SLOT) { revert(0, 0) }
        tstore(REENTRANCY_SLOT, 1)
    }
    _;
    assembly {
        tstore(REENTRANCY_SLOT, 0)
    }
}

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Check your understanding

  1. 1. How long does data written with TSTORE persist?

  2. 2. What is the gas cost of a TSTORE or TLOAD operation?

  3. 3. What is a primary use case for transient storage?

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