OpenSigner

Open-source, self-hostable key management for non-custodial crypto wallets.

Servicefree

OpenSigner is an open-source, self-hostable key management system for non-custodial Ethereum and Solana wallets. It issues, stores, and recovers keys using threshold cryptography, splitting private keys across device, hot, and cold shares that are only reconstructed ephemerally for signing, keeping full custody control with the operator rather than a closed SaaS vendor. It's aimed at developers building wallet or crypto-adjacent products who want to avoid single-vendor key custody, and the project is currently undergoing a Quantstamp audit.

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Problem & pain-point mapping
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Trust & credibility signals

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