bc1 address scheme is the Bech32 segwit address format specified by BIP 0173 and BIP 0350. Bech32 is more efficient with block space. It is supported in many popular wallets and is the preferred address scheme. We have also implemented this address format to keep up with the times.

We also migrate to different service providers at times to meet the SLAs of services such as ours, nothing special to notify about. The main checks you should perform to be sure you are dealing with the cryptomixer is the verification of the Letter of Guarantee as described here before sending the money.