Instead of algo-trading the stock markets?!

There are a number of distributed computing projects (e.g. SETI@home): https://en.wikipedia.org/wiki/List_of_distributed_computing_...

The Ethereum White Paper lists a number of applications for blockchains: https://github.com/ethereum/wiki/wiki/White-Paper

(BitCoin is built on SHA-256, Ethereum is built on Keccak-256 (~SHA-3))

Proof-of-Stake is a lower energy alternative to Proof-of-Work with tradeoffs: https://github.com/ethereum/wiki/wiki/Proof-of-Stake-FAQ

Unfortunately, IDK of another way to find secure consensus (blockchains are consensus protocols) in a DDOS-resistant way with unsolved problems?