moth/doc/tokens.md

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Tokens
======
Tokens are good for a single point in a single category. They are
formed by prepending the category and a colon to the bubblebabble digest
of 3 random octets. A token for the "merfing" category might look like
this:
merfing:xunap-motex
Entropy
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3 octets provides 24 bits of entropy. This gives 16777216 possible
tokens in each category. The longest contest yet run lasted 24 hours,
which would give 2^24/24/60 = 11650 tokens per category per minute. I
think this is a large enough pool to discourage brute-force attacks.
Assuming /dev/urandom is as good as is claimed, brute-force would be the
only way to attack it.