A method is provided for protecting a payment instrument in non-face-to-face transactions. The payment instrument is issued by an issuing entity and associated with an authorized instrument holder. The authorized instrument holder is subject to authentication by a trusted third party with whom the payment instrument holder has previously registered. The method includes: the authorized instrument holder communicating with the issuing entity to block, on a default basis, authorization of the payment instrument for non-face-to-face transactions unless authorized to unblock the payment instrument by the trusted third party; prior to a non-face-to-face transaction, the authorized instrument holder communicating with the trusted third party to subject him or herself to authentication and to request that the payment instrument be unblocked; and the trusted third party authenticating the authorized instrument holder, and if the authentication result is positive, communicating with the issuing entity to request unblocking of the payment instrument.