SeedVault
Last updated: August 17, 2026
SeedVault — Shamir's Secret Sharing
Nyxor Edition
SeedVault is XColdPro's implementation of Shamir's Secret Sharing, a mathematically proven method for dividing a seed phrase into multiple pieces called shares.
How It Works
The user selects how many total shares to create and how many are required to reconstruct the seed phrase. For example, a 3-of-5 configuration creates 5 shares, and any 3 of them can fully recover the wallet.
Possessing fewer than the required threshold — even by a single share — reveals no information about the seed phrase. This is not a conventional encryption scheme that could theoretically be broken with sufficient computing power. It is information-theoretically secure, meaning it remains secure against any existing or future computer, including quantum systems.
Why SeedVault Matters
The purpose of SeedVault is to remove the single point of failure created by storing a seed phrase in one place. A seed phrase written on paper and kept in a single location can be lost through fire, flood, theft, or misplacement.
With SeedVault, shares can be distributed across multiple locations and trusted individuals according to the user's own security plan. For example:
- One share to a spouse
- One share to an attorney
- One share in a safety deposit box
- One share at home
- One share at a second property
If any two shares are lost in a 3-of-5 configuration, the wallet can still be recovered.
Configuration Reference
| Config | Shares | Needed | Can Lose |
|---|---|---|---|
| 2-of-3 | 3 | Any 2 | 1 share |
| 3-of-5 | 5 | Any 3 | 2 shares |
| 5-of-9 | 9 | Any 5 | 4 shares |
Share Export Options
- Copy to clipboard
- Export to text file
- Print on paper directly from the application
Operational Rules
- Never store multiple shares in the same physical location
- Inform beneficiaries that shares exist, without revealing share contents
- Re-test reconstruction after any share replacement or relocation
- Configure SeedVault immediately after creating or importing a wallet
SeedVault can be combined with the Lazarus Protocol so that an estate plan can direct beneficiaries to the shares they need if the user becomes unreachable. For most users, a 3-of-5 configuration is a strong default.