Purpose-built for custody
Separation of concerns, tamper-evident flows, and deterministic builds for verifiable security.
Non-custodial • NFC smartcard • Verified
Ultra-secure cold storage for the next billion on-chain.
Volsungar combines modern mobile convenience with optional NFC smartcard signing. Your keys stay yours — always.
Developer-first
Simple SDKs and open specs. Bring your own workflows, automate attestations, ship faster.
Air-gapped by design
Offline generation and signing with optional transparent ceremony for institutional compliance.
Deterministic firmware
Reproducible builds and public hashes ensure what you flash is what we ship.
Modern cryptography
Curve25519, secp256k1, BIP-32/39/44, with room for PQC migration.
Attestation hooks
Optional remote attest for factory initialization and ceremony proofs.
Defense-in-depth
Hardware isolation, sealed secret storage, and strict least-privilege firmware.
Open verification
Auditable sources, continuous verification, and community-driven hardening.
Zero-trust UX
Human-readable signing, explicit approvals, and robust anti-phishing affordances.
Download Volsungar
Volsungar is live on Google Play and the App Store. Install the app, then optionally pair an NFC smartcard for true cold-signing.
Available now on Google Play and the App Store.