Callisto Network is a layer 1 Ethereum compatible smart contract solution based on a proof-of-work blockchain. Powered by its native cryptocurrency, CLO, Callisto Network is fast, safe, allows for low-cost transactions, and is protected against 51% attacks. Since its launch by the developers of Ethereum Commonwealth (Ethereum Classic), Callisto Network has made numerous contributions to improve Ethereum, Ethereum Classic, EOS, and audited over 400 smart contracts, establishing the team as the leader in the crypto-security industry. We also initiated the Proof of Safety program, designed to highlight projects whose smart contract is highly secure.