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Paper backups burn. Metal plates get lost. Cloud services get hacked.
The safest way in 2026 is Shamir’s Secret Sharing on physical Cryptosign Multi-Sig Backup Cards.
What is Shamir’s Secret Sharing (SSS)?
SSS mathematically splits your 12/24-word seed into multiple shares. You decide the threshold (e.g. any 3 out of 5 cards can recover the seed, but 2 cards = nothing).
Why Combine SSS with Cryptosign Cards?
- Blind Printing = true zero-knowledge
- 5 material choices: Titanium, Carbon Fiber, PLA, etc.
- Free air-gapped tool included
Step-by-Step Guide (with screenshots)
- Open the free Air gapped Terminal
- Paste your seed phrase
- Choose threshold (3-of-5 recommended)
- Print encrypted shares on your chosen cards
- Test reconstruction
Real Customer Setups
3-of-5 Titanium for main wallet
5-of-7 Carbon Fiber for inheritance
Conclusion
Stop trusting paper and single metal plates. Upgrade to proper Shamir SSS with Cryptosign Blind-Printed cards.