Moon dust is more valuable than gold, but how can you prove that the dust that you have really came from the moon?  There would need to be some mechanism for encasing moon dust in some sort of tamper proof container with security features, which means that mining rights would need to be regulated.  

Since much of the moon is owned through the Lunar Registry (http://lunarregistry.com) does this complicate mining rights, or do the laws of space not cover this type of activity?