Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &

Tangem Wallet Pack of 2 - Secure Crypto Wallet - Trusted Cold Storage for Bitcoin, Ethereum, NFT's &
Key item features Ultimate Security: Generates a private key that remains on the card, safeguarding crypto and NFTs from hackers with EAL6+ certification and audited firmware. Versatile Compatibility: Manages over 13,000 tokens across 70+ blockchains, supporting DeFi, NFTs, and DeEx without wires, Bluetooth, or USB. Effortless Operation: Utilizes NFC for secure transactions via a mobile device and the Tangem app, enabling buying and selling crypto with various payment methods. Smart Backup: Features a second Tangem Wallet as a backup, eliminating the need for paper, pictures, or seed phrases for recovery. Durable Design: Boasts IP68 protection against environmental conditions, ensuring longevity and robust physical security. Comprehensive Support: Compatible with Bitcoin, Ethereum, Solana, XRP, USDT, and over 6,000 cryptocurrencies, integrating with dApps and WalletConnect.

LBANK

LBANK

Shamir seed backup: SLIP-39 (Trezor) vs splitting a BIP39 seed into encrypted shares?

Title: Shamir seed backup: SLIP-39 (Trezor) vs splitting a BIP39 seed into encrypted shares?

I'm building an open-source inheritance tool (vault.js) that runs offline on Tails. It takes a BIP39 seed, splits it 3-of-5 with Shamir, then encrypts each share with Argon2id + AES-256-GCM under a passphrase.

Trezor uses SLIP-39 instead, where the shares are word lists and the wallet itself rebuilds the seed.

What are the security trade-offs between the two approaches?

  • Is encrypting each share worth it, or does it add a new single point of failure (the passphrase)?
  • Does splitting a BIP39 seed carry known risks that SLIP-39 was designed to avoid?
  • For heirs who aren't technical, which is safer to recover from in 20 years?

Code and threat model: https://github.com/Ashworth78/btcguardianshq



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