OpenSigner

OpenSigner is an open-source, self-hostable key management stack for non-custodial wallets, supporting Ethereum and Solana, with plans for more chains. It allows developers to create and manage wallets without taking custody of keys, integrating with existing authentication systems and running in the cloud or on-premises to avoid vendor lock-in. This design ensures users control their keys, reducing custodial licensing and compliance burdens, and offers flexibility to scale infrastructure as needed.