Wow, talk about timing!
I've been looking for the best ways to trade between blockchains... @kingscrown has an article somewhere on Steemit that talks about buying LTC with BTC, then sending the LTC to the desired exchange, then buying BTC back.
I would want to know more about that Tendermint middleware, it seems to be a pretty important part of the process and the most likely element to be vulnerable if attacked.
Regardless, if something like this can become a reality, it would be a huge step toward the general acceptance of all cryptocurrency. You've got me pretty excited with this! Followed and upvoted, for sure.
Keep up
@aTone