People love to get all excited about leaks of official SDKs or code... but really, rarely are they all that amazing. Early on in development of homebrew for a console, they can help make things move much faster, but at the expense of legally tainting everything they touch.
They aren't. Signatures are only checked at install time, so channels don't actually need to be signed as long as you have some exploit path to get them installed.
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They never implemented hashtrees for NAND contents, and doing a full ahead of time hash check at launch would be too slow. They finally implemented hashtrees for NAND stuff on the Wii U.
End of conversation
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