function _getDepositedBalance(address account_) internal view override returns (uint256) {
    if (account_ == address(0) || account_ == collateralVault) {
        return 0;
    }

    bytes12[] memory userVault = vaults[account_];

    //add up all balances of all vaults registered in the wrapper and owned by the account
    uint256 collateral;
    DataTypes.Balances memory balance;
    uint256 userVaultLength = userVault.length;
    for (uint256 i = 0; i < userVaultLength; i++) {
        if (cauldron.vaults(userVault[i]).owner == account_) {
            balance = cauldron.balances(userVault[i]);
            collateral = collateral + balance.ink;
        }
    }

    //add to balance of this token
    return _balanceOf[account_] + collateral;
}
