SLIP39: The New Frontier of Security for Your Bitcoin

What is the SLIP39 Protocol and Why You Should Know About It

The world of cryptocurrencies evolves at a constant pace, and with it, security systems as well. If you own Bitcoin or other cryptocurrencies, protecting your private keys is fundamental. The SLIP39 protocol represents a significant step forward in this area. Let’s discover together what it is, how it works, and which hardware wallets support it.

The SLIP39 Protocol: Basics and Operation

SLIP39 (Satoshi Labs Improvement Proposal 39) is a protocol developed by Trezor that improves the way we protect our cryptocurrencies. Unlike the traditional BIP39, which uses a single seed phrase of 12 or 24 words, SLIP39 implements a system based on the concept of Shamir Secret Sharing (SSS). The principle is simple but powerful: instead of having a single seed phrase that represents a “single point of failure,” SLIP39 allows you to divide your secret into multiple parts (called “shares” or “fragments”). To recover access to your funds, you’ll only need a predefined number of these fragments.

How it works in practice:

1. You generate a master key that is divided into X number of fragments
2. You define how many fragments (Y) are needed to reconstruct the original key
3. You distribute these fragments in different locations or among trusted people

For example, in a “6 of 10” configuration, the key is divided into 10 fragments, and at least 6 are needed to reconstruct it. This means you can lose up to 4 fragments without compromising access to your funds.

Key Differences Between SLIP39 and BIP39

SLIP39 differs from traditional BIP39 in several aspects:

• Number of words: SLIP39 uses a 20-word recovery phrase, while BIP39 typically uses 12 or 24 words
• Vocabulary: SLIP39 contains a list of 1024 words, completely different from those of BIP39 which uses 2048
• Security structure: BIP39 creates a single point of failure, while SLIP39 distributes the risk
• Flexibility: SLIP39 allows customized configurations to balance security and practicality

Advantages of the SLIP39 Protocol

Adopting SLIP39 offers several concrete benefits:

• Elimination of single point of failure: If you lose one fragment, you can still recover your funds with the others
• Greater security against theft: A thief who finds a single fragment cannot access your funds
• Protection against natural disasters: By distributing fragments in different locations, you reduce the risk of total loss
• Estate planning: You can distribute fragments among family members or trustees to ensure access in case of emergency

Which Hardware Wallets Support SLIP39?

Currently, support for SLIP39 is limited, but growing:

Trezor: The main supporter of this standard. Recent models like Trezor Safe 3 and Trezor Safe 5 natively support SLIP39. The Trezor Safe 5 uses a 20-word seed phrase based on SLIP39 by default, although it also allows the use of traditional BIP39.

Other hardware wallets: Some wallets like Keystone offer support for Shamir Secret Sharing, but the complete implementation of SLIP39 is mainly associated with Trezor devices.

Software wallets: Some software wallets like Electrum, Sparrow, Rabby, and BlueWallet have begun to support the SLIP39 standard, allowing fund recovery even without a Trezor device.

How to Configure SLIP39 on Your Trezor

If you own a compatible Trezor, here’s how to set up SLIP39:

1. Connect your Trezor device to the computer and open Trezor Suite
2. During initial setup, choose “Create new wallet”
3. Select “Shamir Backup (SLIP39)” when asked for the backup type
4. Define the total number of fragments and how many are needed for recovery
5. Carefully write down each fragment on separate physical media (preferably on resistant metal)
6. Store the fragments in secure and separate locations

Practical Considerations and Limitations

Before adopting SLIP39, consider these aspects:

• Management complexity: Managing multiple fragments requires organization
• Limited compatibility: Not all wallets support SLIP39
• Risk of loss: If you lose too many fragments, your funds will be unrecoverable
• Learning curve: SLIP39 requires a deeper understanding of security concepts

The Future of SLIP39

Trezor is actively promoting the adoption of SLIP39 through bounty programs for developers who integrate this standard into their wallets. With rewards ranging from $2,000 to $6,000, the company aims to make SLIP39 the reference standard for cryptocurrency security. Considering the advantages in terms of security and flexibility, it’s likely that we’ll see growing adoption of this protocol in the coming years.

The SLIP39 protocol represents a significant step forward in cryptocurrency security. By eliminating the single point of failure and offering greater flexibility in backup management, SLIP39 addresses one of the main concerns of cryptocurrency holders: long-term security. If you own a compatible Trezor hardware wallet, it’s worth considering adopting this standard to improve the protection of your digital assets. Remember that the security of your cryptocurrencies depends on the robustness of your backup system and your diligence in managing it.

Have you already tried SLIP39 or are you thinking of adopting it? What are your current strategies for protecting your cryptocurrencies? Share your experience in the comments!