COLDCARD HAS TWO DICE MODES.
ONE USES COLDCARD ENTROPY AND THEN ADDS USER PROVIDED DICE RANDOMNESS ON TOP. THIS MODE GENERATES A SECURE SEED REGARDLESS OF DICE ROLLS.
THE OTHER IS USER PROVIDED DICE ROLL ENTROPY ONLY. IF A USER DOES NOT BRING ENOUGH RANDOMNESS TO SEED GENERATION IN THIS MODE - RECOMMENDED TO PROVIDE GREATER THAN 100 GOOD DICE ROLLS - THEY CAN GENERATE AN INSECURE SEED. THIS MODE ENABLES AN ADVANCED USER TO GENERATE A SEED IN A REPRODUCIBLE WAY WITHOUT TRUSTING COLDCARD.
Yelling this while reading makes it hit home harder.
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The current firmware doesn't allow you to do fewer dice rolls than the 128 or 256 bits of entropy required