I've never been a master at the technical side of bitcoin. I know enough to explain to new people why they should embrace it in political discussions and that's about all.
Recently I learned that other data is stored in the block chain. I got to thinking: What stops someone from putting child porn for example and screwing over many people who would then have a copy stored in their blockchain?
There's nothing stopping someone sending child porn (or indeed any 'illegal' data) to someone's bank account by encoding the bits as a whole lot of microtransfers for $0.01 or $0.02 for example.