YubiShard
Splits a crypto wallet seed phrase across multiple YubiKeys using Shamir's Secret Sharing, so no single key is enough
🔗 Visit YubiShard
Description
Writing your crypto wallet recovery phrase on a piece of paper means one theft or one house fire away from losing everything — or having a thief steal it outright. YubiShard splits that single point of failure into several pieces, each stored on its own hardware security key, so that losing or even having one stolen isn't enough to compromise the wallet.
YubiShard is a client-side cryptographic tool that splits a BIP-39 or SLIP-39 wallet seed phrase using Shamir's Secret Sharing and stores each resulting share on a separate YubiKey. It supports configurable thresholds (for example 3-of-5, where any 3 keys recover the wallet but fewer reveal nothing). It runs entirely in the browser with zero network requests, is small enough to audit in about an hour, and can be used hosted at yubishard.com or run fully locally. Shares are compatible with SLIP-39 wallets including Trezor, Electrum, Sparrow and Rabby.
💬 Our review
The short version: for self-custody crypto users, splitting a seed phrase across hardware keys instead of one paper backup is a meaningfully stronger security model, and YubiShard's zero-network, auditable design backs up that claim rather than just asserting it.
Compared to Trezor's built-in Shamir backup (limited to Trezor hardware) or a plain paper backup, YubiShard works across multiple SLIP-39-compatible wallets and uses YubiKeys most security-conscious users may already own. The tradeoffs matter: it currently requires Chrome and YubiKey firmware 5.7+, shares are protected only by the key's PIN (a stolen key plus a known PIN is a real risk), and if you lose more keys than your threshold allows, recovery is impossible by design. Free and open source with verified test vectors — worth using if you already understand Shamir-based backups and own multiple YubiKeys; overkill for casual crypto holders who'd be better served by a single hardware wallet.
📊 Global score
🤖 AI-enriched data
Gratuit, open source. Utilisable en ligne sur yubishard.com ou en local.
Pros
Zéro dépendance, fichier unique, aucune requête réseau — auditable en environ une heure
Cryptographie vérifiée face aux vecteurs de test officiels Trezor (SLIP-39, BIP-39, BIP-32)
Fonctionne entièrement hors ligne après chargement de la page
Compatible BIP-39 et SLIP-39 avec des wallets grand public (Trezor, Electrum, Sparrow)
Cons
Adoption minimale (1 étoile, 0 fork), pas encore éprouvé en production à grande échelle
Limité à Chrome et aux YubiKeys en firmware 5.7+ (pas de Firefox, clés anciennes ou Windows 10)
Parts protégées uniquement par le code PIN de la clé — clé volée + PIN connu = wallet compromis
Récupération impossible si plus de clés que le seuil sont perdues