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From: Gregory Maxwell <greg@xiph.org>
Date: Tue, 28 Jun 2016 21:36:00 +0000
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	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] BIP 151
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On Tue, Jun 28, 2016 at 9:22 PM, Eric Voskuil via bitcoin-dev
<bitcoin-dev@lists.linuxfoundation.org> wrote:
> An "out of band key check" is not part of BIP151.

It has a session ID for this purpose.

> It requires a secure channel and is authentication. So BIP151 doesn't provide the tools to detect an attack, that requires authentication. A general requirement for authentication is the issue I have raised.

One might wonder how you ever use a Bitcoin address, or even why we
might guess these emails from "you" aren't actually coming from the
NSA.