B-money was one of the earliest cryptocurrencies, which was never launched officially. B-money endeavored to provide many of the same services and features (anonymous, distributed cash system) that cryptocurrencies of today provide. It was invented by Wei Dai. He is a member of Cypherpunks and co proposed VMAC message authentication algorithm.

The smallest unit of Ether is named as Wei in his honor. 1 Wei is one quintillionth of an Ether.