The UN and EU are proposing a solution to child sex trafficking based on Moldova, one of Europe's poorest countries. According to a Reuters report, many children born in Moldova do not have official identity documents, making them attractive for sex trafficking because they're outside the normal system where governments track the existence of its citizens. The proposal is to implement a system using Blockchain to give these children "paperless documents" containing immutable biometric identification information.

While Bitcoin itself may become irrelevant - i.e. it might be banned for legal use, and therefore its use would be limited to the shadowy underworld - the Blockchain technology it's built on is of wide-spread interest. The key features are using strong encryption to implement a ledger of data that is strongly protected by that encryption. It seems possible to use this for human identification -- if a set of data can be identified that automagically computes a security key that indexes into the blockchain, ...etc...