Blockchain-based digital currencies are of radical importance in today’s trading activities. As a result, a number of digital currency exchanges were founded and their usage is exploding. At the same time with the rise of a tokenized economy, more and more countries such as Japan, Germany, and Australia, are accepting
cryptocurrency payments. There is huge potential that the market will continue to expand globally and accept the commercialization of digital currency.
Currently, most digital currency exchanges and peer-to-peer transaction providers focus on ensuring the security of transactions but pay little attention to fairness. For example, HTLC (Hashed Time-lock Contract), a widely-used atomic exchange technology, is vulnerable to denial of service (DoS) attacks. Attackers may launch DoS attacks in the period of time-lock to make the counterparty unable to obtain a refund in a specific time.
Themis