Three Sigma is a blockchain engineering and research firm. Their services include code audits, economic modeling, and blockchain engineering. They work closely with teams to provide secure smart contract auditing services and support DeFi founders in evaluating market risk and optimizing mechanism design. They also offer end-to-end services for implementing blockchain solutions and conduct academic research on privacy solutions and smart contract security. They aim to advance blockchain adoption and contribute to the healthy development of the crypto/web3 space.