Thinktecture IdentityServer v3 AspNetIdentity
Overview
Thinktecture.IdentityServer.v3.AspNetIdentity is a User Service plugin for IdentityServer v3 that uses ASP.NET Identity as its identity management library. In other words, you're using IdentityServer v3 and you want to use ASP.NET Identity as your database for user passwords, then this is the project you're looking for.