The best way to check which resolver you are actually using is to visit this website. https://dnsleaktest.com/ Further explanations are in a webupd8.com ...
To utilize DNS -Over- HTTPS (DoH) or other encrypted DNS protocols with Pi-hole, preventing man-in-the-middle attacks between Pi-hole and upstream DNS servers.
Testing DNSCrypt . To test dnscrypt-proxy to assure it is working properly, run: dig google.com @localhost -p 2053. It should complete quickly with a list of ...
Home of the DNSCrypt project, a protocol to improve DNS security. Download DNSCrypt clients, the DNSCrypt server proxy, and read the specifications here.