In order to sign in with your Namecoin identity, you have to sign a challenge message with the Namecoin address holding your identity. This process does not reveal your private key to this website or anyone else, but can be used to prove that you are indeed the owner of your identity.
Copyright © 2013–2016 by Daniel Kraft. NameID is free software under the terms of the AGPL v3, check out the source code!
BTC: 1Nameid3brhZrbTN1M7t6afMAfVBiGioJT | NMC: NAmeid5L2ZcaQFszYwk4sa929zbQymaaWa