Abstract: The adoption of decentralized cryptocurrency plat-forms is growing fast, thanks to the implementation of Blockchain technology and smart contracts. It encourages the novel frame-works in a wide range of applications including finance and payment methods such as cash on delivery. However, a large number of smart contracts developed for cash on delivery suffer from fraudulent transactions which enable malicious participants to break the signed contracts without sufficient penalties. A shipper will involve in the system and place a mortgage to ensure reliability. A buyer also pledges an amount of money when making the order. Our process not only ensures the interests of a seller but also prevents a fraud shipper. The penalties will be made in two scenarios: (i) the buyer refuses to receive the commodities without any reliable reasons; and (ii) the shipper attempts to make any modification on the delivered goods during transportation. To help developers create more secure and reliable cash on delivery system, we introduce double smart contracts, a framework rooted in Blockchain technology and Ethereum, to tackle those mentioned problems. We also contribute our solution as an open source software that developers can easily add to their implementation to enhance functionality.

Ngoc Tien Thanh Le, Quoc Nghiep Nguyen, Nguyen Ngoc Phien, Nghia Duong-Trung, Thai Tam Huynh, The Phuc Nguyen and Ha Xuan Son, “Assuring Non-fraudulent Transactions in Cash on Delivery by Introducing Double Smart Contracts” International Journal of Advanced Computer Science and Applications(IJACSA), 10(5), 2019. http://dx.doi.org/10.14569/IJACSA.2019.0100584

@article{Le2019,
title = {Assuring Non-fraudulent Transactions in Cash on Delivery by Introducing Double Smart Contracts},
journal = {International Journal of Advanced Computer Science and Applications},
doi = {10.14569/IJACSA.2019.0100584},
url = {http://dx.doi.org/10.14569/IJACSA.2019.0100584},
year = {2019},
publisher = {The Science and Information Organization},
volume = {10},
number = {5},
author = {Ngoc Tien Thanh Le and Quoc Nghiep Nguyen and Nguyen Ngoc Phien and Nghia Duong-Trung and Thai Tam Huynh and The Phuc Nguyen and Ha Xuan Son}
}