A mistake, one billion less: he lost his private key and with it a fortune in ETH.

The Estonian financier and founder of LHV Bank, Rain Lõhmus, invested $75,000 in the Ethereum ICO in 2015. But there is one detail: he lost the seed phrase for his wallet.

Today, that address holds more than $1.11 billion. There is no access to the funds, and Lõhmus was at one time one of the few who believed in the future of cryptocurrencies from their early stages.