What NuGet packages are needed for oauth 2 only

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OAuth

Assume I already have a user data store that I am happy with (Usernames, Hashed passwords, etc ...) and all I want to add is the ability to issue and process JWT tokens and refresh tokens. What would be the minimal NuGet packages that would be needed?

I realize ASP Identity is a proven system, I would just like to figure out what is needed to issue OAuth 2.0 JWT tokens using Microsoft's NuGet packages. Assume that I already have the code to properly validate a username and password and I can determine validated or not validated.

What I have tried:

Many examples list these NuGet packages ...

Microsoft.Owin
Microsoft.Owin.Host.SystemWeb
Microsoft.Owin.Security.OAuth
Microsoft ASP.NET Identity Owin

Yet I am not sure why "Microsoft ASP.NET Identity Owin" is needed if ASP.NET Identity is not being used.