@misc{cryptoeprint:2022:407,
author = {Edward Eaton and
Sajin Sasy and
Ian Goldberg},
title = {Improving the Privacy of Tor Onion Services},
howpublished = {Cryptology ePrint Archive, Report 2022/407},
year = {2022},
note = {\url{https://ia.cr/2022/407}},
}
You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.