It defaults to OpenDNS because they have been sponsoring development and run the only publicly available DNSCrypt resolvers. You are free to modify the code fo

It defaults to OpenDNS because they have been sponsoring development and run the only publicly available DNSCrypt resolvers. You are free to modify the code for the clients to point to your own server, setup your own server using the proxy code provided, or configure your authoritative DNS servers to talk securely to OpenDNS and protect the entire chain using DNSCurve (which DNSCrypt is based on).