fix probably DoS hole

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as reported in dogecoin this line allows DoS errors.

moon coin has no cap, I push second fix. second fix will be hardfork
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dGNodW1AdmlzdG9tYWlsLmNvbT4ACgkQu8Tc5rjr4Il8ywCgsFf0dIjg1cEJsp29
/hiTvM43aYoAoOSP/4Ot3JvOUr8HAY8KoHRqRiSB
=Zwaz
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