Over the last weeks I managed to use steganographic methods to store custom data in the block chain. The only required information to retrieve the data is the starting block number and information about the algorithm that was used to store the data.

This data contains information that is considered illegal in most Western countries. In fact, most countries are likely to send you to jail, if you knowingly spread this data. Which is exactly what you're doing right now - if you're running a Bitcoin client.

Please consider this as a warning. In exactly one week from now I will inform US police departments about the way how the data can be retrieved from the block chain and how IP addresses of nodes distributing this data can be collected. I can't tell you what to do, but by running a Bitcoin client right now you're in legal jeopardy.