Really exited to see the Whitepaper released! Have been waiting on this day since 2013 
I must admit I have a hard time getting my head around it though. So perhaps my question is already answered in the paper and I just didn't understand it...
So the Universe is split up in X shards. Each shard is a part of the network contain transaction information, right?
Now what happens if a bad actor (Bob) sets up a lot of nodes that store, say, Shard (2) of the network and by that stores all or at least the majority of that shard.
Now Bob sends a a payment to Alice in shard (3). Alice now asks a node serving Shard (2) if that transaction is valid. But as Shard(2) is controlled by Bob, can't he return false information and thus double spend transactions over and over?
I must admit I have a hard time getting my head around it though. So perhaps my question is already answered in the paper and I just didn't understand it...
So the Universe is split up in X shards. Each shard is a part of the network contain transaction information, right?
Now what happens if a bad actor (Bob) sets up a lot of nodes that store, say, Shard (2) of the network and by that stores all or at least the majority of that shard.
Now Bob sends a a payment to Alice in shard (3). Alice now asks a node serving Shard (2) if that transaction is valid. But as Shard(2) is controlled by Bob, can't he return false information and thus double spend transactions over and over?