I know that there is Chipmixer which sends me chips that was created in the past. I like the principle of this site, but how can I be sure, that they really don`t save the data, and if the site will be hacked and everything revealed, the chips can be connected to me?
IIRC, chipmixer does not store sessions for longer than 48 hours, so in case of a hack or breach, your data is not available to be leaked.
For extra privacy, you can use it over the For browser and use a .onion address to access the website.