Abstract: A secured mutual confirmation method for tracing and verifying product identity, origin and authentication may comprise at least a seller and at least a buyer, and a series of transactions between the seller and the buyer that can be realized in an online system. The transactions comprise purchase order (PO), real shipment (RS) and shipment confirmation (SC), and one block comprising a set of PO, RS and SC is configured to be registered by a concept of blockchain. In the present invention, all processes of the transactions in the system between the seller and the buyer are monitored and the messages therebetween are encrypted, which makes the online transaction more secured and reliable for both the seller and the buyer.