Vitalik Buterin wants you to know he is alive. In recent years, after it was discovered just how Orwellian a few Western countries had become as regards digital age communications, people became suspicious that the likes of Julian Assange, Edward Snowden, and others had been disappeared. Buterin plays on this, maybe making a clever nod to regulatory capture, in the following tweet:
https://www.cryptocoinsnews.com/vitalik-buterin-uses-ethereum-blockchain-prove-alive/