A Crosschain-Based Fair Exchange of Products For Poverty Alleviation

Through providing products or financial assistance, poverty alleviation is an effective way to reduce poverty. With properties of decentralization, traceability, and publicity, blockchain technology has been well studied to solve the problems of corruption, single point of failure, and complex transaction procedure in traditional centralized poverty alleviation platforms. However, most of poverty alleviation programs in the market are built on single blockchain, which contain only one kind of product information. It is difficult for products to be exchanged on different blockchains, which limits the further expansion of poverty alleviation. This paper proposes a universal and efficient cross-chain fair exchange scheme for poverty-alleviation products. Specifically, we employ an adaptor signature scheme to achieve fairness in the exchange. It ensures that when one party gets the exchanged poverty alleviation product, the other party will also get his corresponding product. In addition, we also adopt the verifiable time discrete logarithm algorithm to solve the problem that the lack of a special scripting language does not allow us to set "timeout" on the transaction and fall into a deadlock problem. Finally, we deploy the scheme on the local environment, public test chains of Ethereum, and conduct a series of experiments to verify its effectiveness and efficiency.