When it comes to people who had a significant impact on cryptocurrencies in the 20th century, here are some people to watch:

Whitfield Diffie and Martin Hellman:

They are the founders of modern cryptography and have won the Turing Award for their outstanding contributions to cryptography.

Nick Szabo:

Regarded as the "father of smart contracts", he proposed the concept of Bitcoin's predecessor, Bitcoin Gold. He continues to contribute his technical knowledge and insights to the crypto industry.

Vitalik Buterin:

The founder of Ethereum, he has made great contributions to blockchain technology, potential and applications.

Gavin Wood:

The founder of Polkadot, has a deep understanding of blockchain technology and cross-chain interoperability.

Cynthia Lummis:

A US senator who actively supports the development of cryptocurrencies and blockchain technology.

Vitalik Buterin:

The founder of Ethereum, he has made great contributions to the development of smart contracts and decentralized applications.

Barry Silbert:

The founder and CEO of Digital Currency Group, who has promoted the development of cryptocurrencies.

Jack Dorsey: CEO of Twitter, who has a keen interest in cryptocurrency and blockchain technology.