Sidechains can be an open, standard way to have a transaction database, instead of us (and every other developer) with different solutions to this problem. It'

Sidechains can be an open, standard way to have a transaction database, instead of us (and every other developer) with different solutions to this problem. It's also worth mentioning a sidechain or payment channels can be "flushed" to the Bitcoin Blockchain (syncing up the balances of off-chain debits and credits) and this is not a trivial operation. If there is a community effort to a robust solution to this problem that other virtual worlds can also implement and inter-operate, makes total sense for us to test it and support it.