commitVote.sol

function commitVote(uint pollID, bytes32 secretHash, uint numTokens, uint prevPollID) external {
  require(commitPeriodActive(pollID));
  require(voteTokenBalance[msg.sender] >= numTokens); // prevent user from overspending
  require(pollID != 0);                // prevent user from committing to zero node placerholder

  uint nextPollID = dllMap[msg.sender].getNext(prevPollID);

  require(validPosition(prevPollID, nextPollID, msg.sender, numTokens));
  dllMap[msg.sender].insert(prevPollID, pollID, nextPollID);

  bytes32 UUID = attrUUID(msg.sender, pollID);

  store.attachAttribute(UUID, "numTokens", numTokens);
  store.attachAttribute(UUID, "commitHash", uint(secretHash));
}