Looks like we need a book on post bottom connections!

One I've used more than once is HDG "eye" bolts set in concrete wet (with nuts & washers) or dry with epoxy. Install a nut with a large square "washer" above it at about the desired height of the post bottom before you set the bolts. I like to leave some daylight under posts.

Next mortice the bottom of the posts for the eye bolts. Raise and adjust the "washers until the building is right and peg the posts through the "eye". Simple, but does require some care in layout. I would have to beleive a 1" dia. locust peg is pretty good for uplift too.

Rudy