During a recent telephone conversation with a timber framing friend, I mentioned the need for more information about attaching timber frames posts to concrete foundations. He suggested a web site where you can get connectors.
Here is a link to that site:
Simpson Strongties
This page has many connectors shown on it, some that are hidden, others that are not. And there are many more available from this company that you can use.
Good luck, Jim

Whatever you do, have fun doing it!