From: Tom Zander <tomz@freedommail.ch>
To: bitcoin-dev@lists.linuxfoundation.org
Date: Fri, 14 Apr 2017 21:20:39 +0200
Message-ID: <1521038.c5zslb6dar@cherry>
In-Reply-To: <CAAS2fgRdSOu8N6L3+fBpnye+rM+W6+F=cePy=9oL4tJuCj=Jsw@mail.gmail.com>
References: <CAAS2fgRdSOu8N6L3+fBpnye+rM+W6+F=cePy=9oL4tJuCj=Jsw@mail.gmail.com>
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Subject: Re: [bitcoin-dev] I do not support the BIP 148 UASF
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On Friday, 14 April 2017 09:56:31 CEST Gregory Maxwell via bitcoin-dev 
wrote:
> Segwit was carefully engineered so that older unmodified miners could
> continue operating _completely_ without interruption after segwit
> activates.


> They [Older nodes] can
> upgrade to it [segwit] on their own schedule. The only risk 
> non-participating
> miners take after segwit activation is that if someone else mines an
> invalid block they would extend it,

This is false,

a segwit transaction to the miner you describe is an "everyone can spend" 
transaction, and as such a miner that does not validate the segregated area 
in a post-segwit world will be able to create blocks that will not validate 
for segwit miners by including a transaction that spends a SW tx.

This would then lead to a chain-fork as the SW miners reject it and the non-
SW miners continue to mine on it.


-- 
Tom Zander
Blog: https://zander.github.io
Vlog: https://vimeo.com/channels/tomscryptochannel