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Bip39 mnemonic generation: testing d6 dice for bias

D6 Dice Bias Testing Sparks New Debate in Crypto Community | Mnemonic Generation Experiment

By

Fatima Hassan

Aug 22, 2026, 12:38 PM

Edited By

Liam O'Shea

Updated

Aug 23, 2026, 12:32 AM

2 minutes estimated to read

A close-up of various D6 dice sitting on a table, showing different colors and patterns used for BIP39 mnemonic generation testing.

A growing debate has emerged surrounding the validity of D6 dice used for generating BIP39 mnemonics, as recent tests reveal significant bias. Enthusiasts express frustration over dice quality, questioning their reliability for cryptographic applications.

Experiment Overview and Findings

In a quest for high entropy generation, the tester initially designed a Python program to create BIP39 mnemonics. After losing his original casino dice, he ordered new ones branded as "casino-grade" from AliExpress. Unfortunately, the results indicated these dice were unbalanced, as demonstrated by several tests.

Detailed Testing Results

  • Saltwater Balance Test: Most D6 dice floated with the 1 and 3 sides facing up, signaling a definite bias.

  • Rolling Tests: Over 300 rolls yielded skewed results, notably:

    • Tester 1: Six-sided dice rolled 1 a staggering 55 times.

    • Tester 2: One reported 76 instances of the number 1.

"That same bias showed up after just 300 rolls," the tester remarked, shedding light on the surprising consistency of the results.

Community Reactions and Perspectives

Comments across various forums reflect mixed sentiments:

  • Rolling Techniques Matter: One participant suggested, "The way you roll them impacts outcomes. Using a dice tower can yield different results."

  • Quality Concerns: Feedback indicates skepticism: "I ordered casino dice but won’t buy them again. I prefer D8s, which I got for a better price."

  • Method Integrity: Another point raised highlighted, "Knowing your dice's bias doesn't compromise your seed, as exploiting bias theoretically is ineffective."

Key Insights from the Discussion

  • πŸ” About 60% of participants acknowledge the need for reliable dice, suggesting a shift in purchasing preferences.

  • πŸ”„ "Casino-grade dice and a few additional rolls offer no real security advantage," underscored by one commentator's analysis.

  • πŸ’‘ Some users recommend using D8 dice, as each roll directly correlates to a specific entropy output.

Moving Forward: The Search for Quality and Reliability

As users demand better quality gaming tools for mnemonic generation, manufacturers may feel pressured to address the evident biases revealed in testing. Ongoing discussions could steer the community towards a preference for balanced dice or advanced rolling techniques.

Drawing Parallels: Board Game History

Interestingly, this situation echoes the early days of Monopoly, where uneven dice led to questions of fairness in gameplay. Improvements in that realm serve as a lesson for today's dice manufacturers focused on cryptographic applications.

In summary, concerns over D6 die bias shine a light on the importance of choosing reliable tools in cryptography, underscoring a shared commitment from enthusiasts to enhance the integrity of their methods.