05-revoke-confirmation.md

Confirm Transaction

1. Checkout the exercise

git checkout exercise-05

2. Exercise

Write your code inside contracts/MultiSigWallet.sol

Complete the revokeConfirmation function

function revokeConfirmation(uint _txIndex)
    public
{

}

• Add appropriate modifiers
  • only owner should be able to call this function
  • transaction at _txIndex must exist
  • transaction at _txIndex must be executed
• Revoke the confirmation
  • require that msg.sender has confirmed the transaction
  • set isConfirmed to false for msg.sender
  • decrement numConfirmations by 1
  • emit RevokeConfirmation

event RevokeConfirmation(address indexed owner, uint indexed txIndex);

3. Test

Test your code

npm test

4. Solution

git checkout exercise-05-solution