Just saw your other post,I'm with b-boy,it doesn't look like a bloodgood,especially with green bark too,but if you're happy with it a 50/50 mix of compost/composted bark seems to be a popular potting medium.Just cover those exposed roots but no more,and untangle any circling ones ,and choose next size pot,not any bigger.

I thought the same thing about it not being a bloodgood but it was in heavy shade and similar trees in full sun were a deep burgundy. Guess we will see...but love the tree overall. Think it has a nice shape. Do bloodgoods lose their color in shade?

Why repot ? looks happy!

Well don't worry,there are some red leafs with green bark too,still nice trees,infact perhaps less common ha ha..and I can see yours does have some red leaves,so I can only assume it has been shaded up 'til now.Personally I haven't seen a bloodgood as green as that but maybe others can comment on the effects of deep shade,perhaps ever since leafing out.I have a green barked red leaf also(suminagashi)only recieves 2/3 hours of morning sun,but that's enough to turn it red.In my climate my more shaded bloodgood looks purple like the others,but when the sun shines through the leaves it has a slight greening,not the blood red of the others it's renowned for.I'm sure your tree will enjoy the sun as much as you.
Whilst we're on the subject(perhaps I should use another thread)I've often heard people in US and hot places speaking of red leafs greening out in hot summer.Whilst I haven't experienced this(and probably won't)I'd be interested to know why this happens...ie: not enough or too much sun causes greeness??

In my part of the country, we have hot dry summers, and some maples will green up in the summer due to I assume dryness. I'm really pleased with the tree...I'm thinking of leaving it in the pot for a year or two until I decide own a good location.