liquidID is a unique OpenID provider with built in spam & identity protection.
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liquidID is an OpenID provider enhanced by an aliasing service. It is like no other OpenID provider.
liquidID is not a spam filter: It provides protection against abuse of your email using email aliases instead [patents pending]. This has the advantages of zero false positives and allows tracking of who can and who can't be trusted.
liquidID also allows you to create general purpose email aliases. You can use these on sites that don't yet support OpenID.