Security
Everything related to security what affects the Vultisig Project
Audits
Kudelski Audit of mobile-tss-lib
mobile-tss-lib
1.5 Follow-up
After the draft report (v1.0) was delivered, the client addressed all findings in the following
PRs:
• Audit 1 #17 (commit 06fc76f4d6d34f21fa5d1cafd1eb594d8ac4fdd7)
• Audit 2 #18 (commit 2577eb3b00d4d58a7318fa0ada726ba7965579ab)
$VULT Contract Audit
The audit was done by Code4rena for the $VULT contract and can be found here.
Staking Contract Audit
The audit was done by Zenith and can be found here.
Threshold Signature Security (TSS and DKLS)
Vultisig currently supports two Threshold Signature Schemes (TSS): GG20 and DKLS. As of March 2025, DKLS is the preferred cryptographic standard for all new vaults on iOS, Android, and macOS. Windows also fully supports DKLS, including vault participation and optional initiation via an advanced toggle. Default behavior may evolve in future releases.
GG20 is a well-established threshold signing protocol that has been battle-tested in production through projects like THORChain, which uses it in open-source, adversarial environments. In Vultisig, GG20 remains available primarily for legacy vaults and advanced configuration cases.
DKLS (Distributed Keygen and Local Signing) is a modern threshold signature scheme developed by Silence Laboratories. It enables multiple trusted devices to sign transactions collaboratively, without ever reconstructing the full private key.
🔒 Both protocols eliminate the need for a seed phrase or centralized private key, offering a seedless, self-custodial experience.
In practice:
Your devices connect only during deliberate signing sessions.
Private key shares are never combined or stored.
An attacker would need access to all your devices simultaneously to forge a signature.
Vultisig will continue to evolve with the latest advancements in TSS protocols to provide secure, resilient self-custody for all users.
Research
The Threshold Signature Scheme is a relatively new area within the field of Multi-Party Computation. As such, advancements in security and efficiency are ongoing and continuously evolving.
Vultisig closely monitors these developments and is committed to adopting more secure and efficient versions as they become available. Additionally, we are actively researching new possibilities within this space.
DKLS Threshold Signing
Vultisig leverages DKLS threshold signatures, a cryptographic scheme developed by Silence Laboratories. This protocol enables multiple trusted devices to sign a transaction together without ever reconstructing or exposing the full private key.
This technique enhances security by eliminating single points of failure—no seed phrase or complete key is ever stored on any single device. Instead, each device holds a secure share of the key, and must participate in the signing process.
🔒 This is how Vultisig enables secure, seedless, self-custody for your crypto.
The DKLS protocol was audited in February 2024 by Trail of Bits. The full audit report is available here (PDF).
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