The two line split public key is really confusing. I think there should be an explanation somewhere. Nevertheless, thanks for answering my two questions.
I think Raiblocks is a really promising coin and it is hard to understand why it is that much under the radar for most investors. Everyone is looking to IOTA because it does not have any fees but there exists Raiblocks with the same feature much longer and has only a bit of the attention IOTA gets. Hope this will change soon. I bought a good stake of Raiblock coins.
I think it's a single address but you might be confused because wallet splits it in two lines. And there is an option to backup wallet seed in Advanced > Accounts