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Bip39 vs. slip39: which seedphrase is harder to crack?

BIP39 vs. SLIP39 | Which Seedphrase is Tougher to Crack?

By

Alice Thompson

Jul 3, 2025, 11:46 AM

Edited By

David Kim

3 minutes reading time

Comparison of BIP39 24-word seedphrase and Slip39 20-word seedphrase illustrating their security features.
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A discussion among crypto enthusiasts reveals a fierce debate: Is a BIP39 24-word seedphrase more secure than a SLIP39 20-word phrase? Analysts have weighed in on the odds of cracking these phrases, with both sides claiming their method triumphs.

The Basics of Seedphrases

Seedphrases are crucial in cryptocurrency, acting as keys to wallets. A BIP39 24-word seedphrase offers 256 bits of entropy, whereas a SLIP39 20-word seedphrase contains 128 bits of entropy. With this difference in security, many argue that the BIP39 option provides a stronger defense against potential breaches.

What Users are Saying

Comments reflect a strong belief in the security of BIP39. One user stated, "A 24-word seed phrase is uncrackable," emphasizing the astronomical odds against guessing one accurately. The odds of cracking a 12-word Bitcoin seedphrase are already 1 in 340 trillion; for a 24-word one, it soars to an inconceivable 1 in 115 quattuordecillion.

"Nobody can possibly guess or crack a Bitcoin seed phrase," another participant said, citing the massive number of potential combinations. This perspective encourages confidence in the security systems in place.

The Numbers Don't Lie

When comparing both seedphrases:

  • BIP39 24-word has 256 bits of entropy.

  • SLIP39 20-word holds 128 bits of entropy.

A frequent observation from users is that neither seedphrase can truly be "cracked". One noted, "there's nothing to crack in that sense as each combination would lead to a new wallet." This notion brings the conversation back to practicalitiesโ€”no current computer could brute force the sheer variety of combinations.

The Consensus

Overall, the sentiment leans heavily toward BIP39 when discussing which seedphrase is hardest to crack. Some maintain both options are nearly secure, while others argue:

  • BIP39's 256 bits of entropy make it significantly more secure.

  • SLIP39's security is adequate for most, but the lower entropy raises concerns.

Key Insights

  • โœฆ "Cracking a slip39 phrase is impossible in practice."

  • โœฆ Users advocate for BIP39 as a stronger choice based on entropy.

  • โœฆ Concerns resonate: 128 bits are not enough for optimal security.

As this debate evolves, many are left pondering: Is your seedphrase secure enough?

What Lies Ahead for Seedphrase Security

Thereโ€™s a strong chance that the ongoing debate between BIP39 and SLIP39 will spark further developments in cryptocurrency security protocols. Analysts predict that by 2026, we could see a shift in mainstream preference toward BIP39 due to its superior 256 bits of entropy, which many believe enhances wallet protection. As more people become aware of security vulnerabilities in digital currencies, experts estimate around 70% of new crypto users might gravitate towards BIP39, deeming it the safer choice. This could lead to innovations within the BIP39 framework, perhaps integrating even more robust features to fortify wallet security against growing hacking threats. The fight for user trust in seedphrase technologies is not just about numbers but revolves around educating people on optimal practices and promoting safer alternatives.

Historical Echoes of Security Choices

Looking back, the 19th-century Gold Rush serves as an intriguing parallel. Just as prospectors sifted through mountains of dirt searching for golden nuggets, our modern-day crypto enthusiasts sift through vast amounts of information about security protocols to protect their digital riches. At that time, claims of untold wealth led many to settle on less secure prospecting methods, paralleling how some might currently trust less reliable seedphrase technologies without fully grasping the risks. This highlights the importance of informed decision-making in times of uncertaintyโ€”whether itโ€™s choosing a site to mine for gold or selecting a seedphrase to safeguard digital assets.