Hi,
what a detailed review. Thanks for helping us and other users by posting your experience while using FoxMixer!
"No single point of failure" policy shows its signs after typing the site URL and pressing the enter button. Actually, I expected a captcha thing will irritate me because I asked my friend to test the response ping time of the site with a different IP addresses (with time limits, of course) thanks to anonymous VPN and Tor network. The bothe onion link and clearnet website work flawlessly.
That's exactly what we are working for!
Correlation between minimum time requirement and network confirmation is not effective for fast mixing practice, for amounts less than 0.5 BTC first confirmation is enough for instant delivery. The double-spend probability is highly unlikely, IMO. Adding a function for disabling time delay can solve this problem and it will be a customizable option for all types of users.
There is still a time correlation, also for amounts < 0.5 BTC.
Many users are just not aware that time correlation is one of the simplest approaches to reveal address dependencies.
That's why we have a minimum mixing time.
A small suggestion: Electrum and Bitcore wallet implementation also lets the customers launch desktop wallets with this shortcut. The mobile interface works well too.
So your suggestion is to implement the address as a clickable "bitcoin:..." uri? That's a good idea.
Adding more altcoins and increasing awareness are my propositions for improving service quality.
Maintaining only one currency with our expectations of reliability, quality and support level is quite some work. Maybe that will happen in the future.
For the awareness: We are on a good way with the trust we receive and the development of our daily userbase.
It's a shame to see other mixers using sigcampaigns and paid news in order to pretend "trust" and scam people afterwards.