Since every wallet software has to know the block chain, can it be used as a universal reference for uncoding other information?  For example, i have an mp3 that i want to send someone.  Instead of sending them an attachment in an email, I send them an even shorter amount of data which goes into a app which uses values in the blockchain to extract the orginal information.

I'd love to learn that bitcoin transactions themselves could be used as automated data transfers.  So that when a recording artist gets a satoshi(or whatever they see reasonable) sent to specific wallet address, the sender automatically gets to play their song, video, 3d print their vinyl, teleport them thru a usb to perform in their living room.  No 3rd party involvement.  Sure would solve ASCAP and BMI's problems with pandora.