If you don't respond to takedowns, that's probably leaning towards being illegal*
If you respond to takedowns and blacklist the hashes, you're most likely fine*
*obviously depends on the jurisdiction and on whether matching hashes to IP:PORT is considered distribution/facilitation/whatever (take TPB's case as an example)
I know someone who ran a pretty large tracker for years, when he received a takedown he just blacklisted the hashes and he's been fine so far.
If you don't respond to takedowns, that's probably leaning towards being illegal*
If you respond to takedowns and blacklist the hashes, you're most likely fine*
*obviously depends on the jurisdiction and on whether matching hashes to IP:PORT is considered distribution/facilitation/whatever (take TPB's case as an example)
I know someone who ran a pretty large tracker for years, when he received a takedown he just blacklisted the hashes and he's been fine so far.