Sarcophagus is a decentralized, blockchain-enabled, cryptographically secure digital dead man's switch. It is designed to provide recovery and storage for encrypted information in the event of the user's incapacitation or loss of control. Sarcophagus is open-source, operated and owned by a DAO, and aims to bring dead man's switch functionality to the web3 ecosystem. It can be used in various scenarios such as emergency communications, digital inheritance, crypto key management, and credential passdown.