Sorry, I didn’t quite get you? How can you move your balance to another leaf, you have only one leaf representing your account (and its balance)? Maybe you’re thinking in terms of using SMTs strictly? If you have time, take a look at @jieyilong’s post: Off-chain Plasma state validation with on-chain smart contract (you can read “Plasma State Construct” and “Probabilistic Plasma State Validation” sections only). I was thinking of something like that, but to use SNARKs instead of random sampling?