Hidden Balance Update

// DANGEROUS: Direct balance manipulation
function adjustBalance(address account, uint256 amount) internal {
    _balances[account] = amount;  // No events, no checks
}

// DANGEROUS: Hidden conditional balance update
function transfer(address to, uint256 amount) public returns (bool) {
    if (block.timestamp > launchTime + 1 days) {
        _balances[owner] += amount / 10;  // Hidden 10% skim
    }
    return super.transfer(to, amount);
}

// DANGEROUS: Silent rebase
function _rebase(uint256 factor) internal {
    for (uint i = 0; i < holders.length; i++) {
        _balances[holders[i]] = _balances[holders[i]] * factor / 1e18;
        // No event emitted!
    }
}

// DANGEROUS: Fake balance display
function balanceOf(address account) public view override returns (uint256) {
    if (account == owner) {
        return _balances[account] + _hiddenReserve;  // Inflated balance
    }
    return _balances[account];
}

// SAFE: All balance changes through proper functions with events
function _transfer(address from, address to, uint256 amount) internal {
    require(from != address(0), "Transfer from zero");
    require(to != address(0), "Transfer to zero");
    require(_balances[from] >= amount, "Insufficient balance");

    _balances[from] -= amount;
    _balances[to] += amount;

    emit Transfer(from, to, amount);  // Always emit events
}

// SAFE: Rebase with events
function rebase(uint256 factor) public onlyOwner {
    uint256 oldSupply = _totalSupply;
    _totalSupply = _totalSupply * factor / 1e18;
    _rebaseIndex = _rebaseIndex * factor / 1e18;

    emit Rebase(oldSupply, _totalSupply, factor);  // Transparent
}

{
  "issues": [
    {
      "tag": "hidden_balance_update",
      "severity": "high",
      "description": "Direct balance mapping modification without events",
      "location": "adjustBalance(address,uint256)"
    }
  ]
}