No. The entire bank account will not be blocked. Only the amount to the extent of application money authorized in the ASBA will be blocked in the bank account. The balance money, if any, in the account can still be used for other purposes. There are two advantages in this approach. The money stays in your account so you continue to earn interest on these funds. Secondly, you don’t have unnecessary transactions of debits and credits without any purpose. That is why an ASBA block works a lot better for investors.