Tor is ending its support for version 2 onion services beginning in July 2021. You can read more about it on the official Tor Project Website:
https://support.torproject.org/onionservices/#v2-deprecation
BitMix Bitcoin Mixer is now running on both v2 and v3 onion addresses. The new BitMix Bitcoin Mixer TOR v3 Onion Address is:
bitmixrxoyitjq3ddtuenmamulooe2cvedbr6vchckczirarjh3tadqd.onion
You can identify v3 onion addresses by their 56 character length, e.g. BitMix Bitcoin Mixer v2 onion address: http://bitmixerazaphafq.onion, and BitMix Bitcoin Mixer v3 onion address: http://bitmixrxoyitjq3ddtuenmamulooe2cvedbr6vchckczirarjh3tadqd.onion
BitMix Bitcoin Mixer provides users with the ability to mix their Bitcoins and attain safety in the process. Once Bitcoins are sent to BitMix, they are jumbled along with a series of other transactions through our Bitcoin Mixer which has a reserve of over 10000 BTC. Combining this with the countless transactions BitMix have handled in the past makes it virtually impossible to pinpoint the source and endpoint of Bitcoins. Due to the size of BitMix Bitcoin Mixer BTC reserve, we are also able to process Bitcoin transactions almost immediately leaving you with no concern of timely delivery of your coins.
https://www.bitmix.app/about/bitcoin-mixer