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Date: Thu, 31 Dec 2015 19:32:20 +0800
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Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Increasing the blocksize as a (generalized)
 softfork.
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On 2015-12-31 18:39, David Chan wrote:
> The UTXO sets may diverge but they actually will be strict
> subsets/supersets of each other as no transaction would be invalid on
> one fork vs another unless the hard fork lasts longer than 100 blocks.

The UTXO sets can also diverge thanks to double spends, i.e. A->B is 
confirmed on the old chain and A->C is confirmed on the new.

--joe.