OpenSigner is an open-source, self-hostable wallet key management system that issues non-custodial cryptographic keys using Shamir's Secret Sharing. It is designed for developers and organizations needing secure, decentralized key management for blockchain applications. The system supports ephemeral signing and flexible recovery options.
OpenSigner is an Infrastructure & Backend product. It focuses on providing secure, non-custodial wallet key management for developers and organizations. It is built as an open-source project for blockchain developers and organizations. OpenSigner is open source under the MIT license. The product ships for the command line, embeddable surfaces, and API, and it can be self-hosted.
Behind OpenSigner is Open Source Maintainers, and the product first shipped in 2025. Development happens publicly on GitHub with 87 stars and 39 commits in the last 90 days. Key capabilities include key management, Shamir's Secret Sharing, and self-hostable. It exposes integrations via a public API.
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