The current e-commerce payment systems for credit or check cards require a payment gateway (PG). This incurs PG fees, which in turn increases the cost of engaging in e-commerce. This paper proposes a simple payment model that uses basic cryptocurrency features, such as public key, private key, and digital signature, to eliminate the need for transaction intermediaries such as public key certificate and PG. This model can process e-commerce payments without registering additional public key certificate, public key, or private key. The use of a digital signature guarantees the integrity and nonrepudiation of electronic payments, besides eliminating the fees for intermediary services such as PG, thereby reducing the overall cost of operating e-commerce services. This proposal is crucial as it is the first attempt to apply blockchain technology to e-commerce payment services. In addition, our model is important because it not only supports the evolution of e-commerce payment technology but also enhances the competitive advantage of using e-commerce.

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