In the aftermath of Judgment Day, we fled to the Exclusion Zone and sought refuge underground. This is what is left of our fallen civilization.

Wei Dai

“Wei Dai (Chinese: 戴维) is a computer engineer known for contributions to cryptography and cryptocurrencies. He developed the Crypto++ cryptographic library, created the b-money cryptocurrency system, and co-proposed the VMAC message authentication algorithm. The smallest subunit of Ether, the wei, is named after him.”

https://en.wikipedia.org/wiki/Wei_Dai