isSpent function

2019-07-15 19:15:06 +03:00 · 2019-07-15 19:15:06 +03:00 · 8657bc8b82
parent eb75bab81b
commit 8657bc8b82
1 changed files with 4 additions and 0 deletions
--- a/contracts/Mixer.sol
+++ b/contracts/Mixer.sol
@ -69,4 +69,8 @@ contract Mixer is MerkleTreeWithHistory {
    }
    emit Withdraw(receiver, nullifier, fee);
  }
+
+  function isSpent(uint256 nullifier) public view returns(bool) {
+    return nullifiers[nullifier];
+  }
 }