The two domains that land here (curvecheck.net and dnscurv.es) were formerly DNSCurve test domains for gdnsd. However, gdnsd has dropped direct support for DNSCurve in the latest developer release, and will soon do so in an upcoming stable release as well. The authoritative servers for these domains no longer understand DNSCurve queries, and the domains will expire and go away soon. In the future, if you want to use DNSCurve with gdnsd, you will have to use separate DNSCurve forwarding software, e.g. CurveDNS.
For general-purpose public testing of gdnsd, please head to: http://gdnsd.net/