If the thief cannot be found and the case cannot be solved; The responsibility will go to the bank, but if the user can't prove that he was not present when the brush was stolen, the bank may shirk the responsibility; Let the credit card merchants be responsible, but the merchants have done their due responsibilities. For example, the signature is consistent with the signature column on the card, or the merchant cannot be found; In the end, the cardholder will bear most of the losses.