The present invention relates to a transactions certification method and system to protect privacy for electronic transactions, ( comprising the steps of: a) receiving and registering client information which is encoded not possible to specify the client; (B) receiving the transactions details of the client that contains the encrypted client transactions identifier from the service provider server, and storing; (C) the client receives the client certification information for client certification information which is registered to the group is made by comparing the client authentication step; (D) determining that the authentication of the client receives the client transactions identifier and the client transactions identifier and a pre-stored cross-match with the search for the transaction history of the client when made; And (e) to generate a message corresponding to the transactions details of the client if it is determined that the client transactions identifier by matching consists of sending to the client. Accordingly, the protection of privacy on transactions details of the client, and it is possible to manage the transactions details of the client.
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