اثبات دارایی های تعیین شده برای تایید کننده برای مبادله بیتکوین با استفاده از رمزنگاری منحنی بیضی شکل

Based on the core technique of blockchain, bitcoin is designed for the first time. Bitcoin is a digital currency and a payment system. The blockchain is a digital ledger that records every bitcoin transaction that has ever occurred. The users’ privacy is preserved in the bitcoin exchange by using the blockchain. In some application scenarios, it is important to show the buyer’s assets strength in order to avoid the troublemakers. At the same time, it is also necessary to preserve the buyer’s assets privacy. In this paper, we propose the novel concept of DV-PoA (designated-verifier proof of assets) for bitcoin exchange. Since bitcoin exchange’s signature takes use of the elliptic curve cryptography, we design the first concrete DV-PoA scheme by using elliptic curve cryptography in order to be consistent with it. Then, we prove the security of the proposed DV-PoA scheme. After that, we analyze its efficiency from the two cases: theory and implementation. Our analysis shows that the designed DV-PoA scheme is provably secure and efficient.