I hadn't heard of this, this is a pretty cool way to provide this proof. Back story: https://www.coindesk.com/markets/2017/06/26/proof-of-life-vitalik-buterin-

I hadn't heard of this, this is a pretty cool way to provide this proof. Back story: https://www.coindesk.com/markets/2017/06/26/proof-of-life-vitalik-buterin-uses-ethereum-to-disprove-death-hoax/ https://www.coindesk.com/markets/2017/06/26/proof-of-life-vi... The block in question (open "Click to see more" and look for the "Hash" field): https://etherscan.io/block/3930000 https://etherscan.io/block/3930000