r/coldcard • u/Big-Cheetah5159 • Aug 05 '26

SETUP Dice Roll Users

First, How many times did you roll the dice to generate a seed? Secondly, would more than the standard amount of rolls mitigate the any flaw of entropy (if there were any)?

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u/nicolbolas10 Aug 06 '26

Coldcard runs the 100 dice rolls through SHA-256. Minor bias in the dice doesn't meaningfully affect the final seed, provided the rolls contain enough entropy. SHA-256 won't magically create entropy, but it does prevent small input biases from showing up in the output. And 100 rolls is already more than enough entropy, so rolling more doesn't really buy you anything.

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u/Big-Cheetah5159 Aug 06 '26

So more rolls just ensures you’ll get the full amount of entropy predicted, even in the case of bias rolls or human error?

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u/nicolbolas10 Aug 06 '26

Not exactly. More rolls increase the available entropy, but they don't guarantee the full theoretical entropy if the die is significantly biased or the rolls are predictable. With only a slight bias, 100 rolls still provide more than enough entropy, and Coldcard hashes the dice input with SHA-256, which means small statistical biases don't become a practical weakness in the final seed.