Could you elaborate on the feasibility of high-frequency trading (HFT) in the world of cryptocurrency? Do the inherent characteristics of digital currencies, such as decentralization and blockchain technology, lend themselves well to the speed and precision required for HFT? Are there any specific challenges or limitations that crypto traders need to be aware of when attempting to engage in HFT strategies? Additionally, what kind of infrastructure or tools are necessary to successfully execute HFT in the crypto space?