What if someone used Ethereum to create a coin that can only be sent to one address, which is the first address it is sent to, and no other. Furthermore, the coin contained the details of your identity. I suppose that a central entity would have to verify that your identity is true. But after applying for this coin through some central entity or review process at that point you could be awarded say a billion worthless HancockCoins. The system works so that you have automatically premined them all and no one else owns any - and any one coin can only be sent once. (I don't know how you would work that programming but it seems like Snapchat kinda) Then you could use the coin as a virtual signature. No one else could sign your name bc the coin could not be resent. It would be like owning a royal seal. If someone stole your supply of HancockCoins you'd be fucked. But if such a thing existed no one could say blame hackers for boneheaded Twitter posts unless they were lacking your HancockCoin seal of identity. There may be other uses for a coin that can only be sent once but nothing else pops into my head at this about- to-go- to-bed hour.