http://w6uowshig4oqhdehbkyykmzb4h5iiaxndfdfwbj6pfixohe5d7bgsyyd.onion/frequently-asked-questions-i-6
There are some 'services' out there who claim they don't have any logs: you can just hope that their service is more trustworthy than their words, because anybody who claims they doesn't keep logs, they are just outright lying. If anything goes wrong in a transaction, if any problem arises from a customer, how can you help them, if you don't have a clue what the hell happened in your system 2 hours ago?