# Truebit on Ethereum Structure

The verification game is testing the program ON-chain. But let’s remind ourselves of the true purpose of Truebit on Ethereum. Computational complexity is so high that programs cannot be run ON-chain and therefore we use Truebit on Ethereum. Therefore, a verification game cannot run the entire program code.

In fact, only one instruction line is used in a verification game. There will be a part of the program code where there is a discrepancy between the Solver and the Verifier. The instruction of that discrepancy point is used to verify who is right. For this, the Truebit on Ethereum contract implements a WebAssembly interpreter.

<figure><img src="/files/6mHhDPyiW9siWPeI71Q2" alt=""><figcaption><p>Truebit Overview Diagram</p></figcaption></figure>


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