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You can use the bitcoin block chain as a reliable way to store information (append-only).

Was wondering why this isn't being advertised as the killer app of the service.

Not information in general, just transactions.

Currently only small text messages are being embedded in the block chain. It wouldn't scale to larger files.

Would it be enough for a magnet url and a short description? The Pirate Bay is moving away from hosting torrent files anyway.

Yes, that would fit easily. Here's an example of the text data that you can find in the block chain by running the "strings" command: http://pastebin.com/ZqqFEqkc

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