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From: James MacWhyte <macwhyte@gmail.com>
Date: Fri, 12 Aug 2016 18:39:07 +0000
Message-ID: <CAH+Axy6WAk+ru8zJ3zU5L9-Rv3mY-YBg2V+U=yE7f5BnaNGqRw@mail.gmail.com>
To: Erik Aronesty <erik@q32.com>, 
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>,
	Gregory Maxwell <greg@xiph.org>
Content-Type: multipart/alternative; boundary=001a113565163ccebd0539e433f0
Subject: Re: [bitcoin-dev] BIP Number Request: Addresses over Audio
Precedence: list

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For reasons others have pointed out, it's not really plausible.

Either way, this has nothing to do with transmitting data over audio.
Please start a new thread if you want to discuss your idea instead of
hijacking this one. Thanks ;)

On Fri, Aug 12, 2016, 05:36 Erik Aronesty via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> I'm imagining a "publishable seed" such that:
>
>  - someone can derive a random bitcoin address from it -  and send funds
> to it.
>  - the possible derived address space is large enough that generating all
> possible addresses would be a barrier
>  - the receiver, however, knowing the private key, can easily scan the
> blockchain fairly efficiently and determine which addresses he has the keys
> to
>  - another interested party cannot easily do so
>
> Perhaps homomorphic encryption may need to be involved?
>
>
> On Thu, Aug 11, 2016 at 8:36 PM, Gregory Maxwell <greg@xiph.org> wrote:
>
>> On Thu, Aug 11, 2016 at 8:37 PM, Erik Aronesty via bitcoin-dev
>> <bitcoin-dev@lists.linuxfoundation.org> wrote:
>> > Still not sure how you can take a BIP32 public seed and figure out if an
>> > address was derived from it though.   I mean, wouldn't I have to
>> compute all
>> > 2^31 possible public child addresses?
>>
>> Which would take a quad core laptop about 8 hours with competent software
>>
>> And presumably you're not using the whole 2^31 space else the receiver
>> also has to do that computation...
>>
>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

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<span>For reasons others have pointed out, it&#39;s not really plausible.</=
span><div><br></div><div>Either way, this has nothing to do with transmitti=
ng data over audio. Please start a new thread if you want to discuss your i=
dea instead of hijacking this one. Thanks ;)<br><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr">On Fri, Aug 12, 2016, 05:36 Erik Aronesty via bitcoin-=
dev &lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-de=
v@lists.linuxfoundation.org</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex"><div dir=3D"ltr"><div>I&#39;m imagining a &quot;publishable seed&qu=
ot; such that:<br><br>=C2=A0- someone can derive a random bitcoin address f=
rom it -=C2=A0 and send funds to it. <br>=C2=A0- the possible derived addre=
ss space is large enough that generating all possible addresses would be a =
barrier<br></div><div>=C2=A0- the receiver, however, knowing the private ke=
y, can easily scan the blockchain fairly efficiently and determine which ad=
dresses he has the keys to<br></div><div>=C2=A0- another interested party c=
annot easily do so<br></div><div><br></div><div>Perhaps homomorphic encrypt=
ion may need to be involved?=C2=A0=C2=A0 <br></div><div><br></div></div><di=
v class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Aug 11, 2016=
 at 8:36 PM, Gregory Maxwell <span dir=3D"ltr">&lt;<a href=3D"mailto:greg@x=
iph.org" target=3D"_blank">greg@xiph.org</a>&gt;</span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex"><span>On Thu, Aug 11, 2016 at 8:37 PM, Erik Aronesty =
via bitcoin-dev<br>
&lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_bla=
nk">bitcoin-dev@lists.linuxfoundation.org</a>&gt; wrote:<br>
&gt; Still not sure how you can take a BIP32 public seed and figure out if =
an<br>
&gt; address was derived from it though.=C2=A0 =C2=A0I mean, wouldn&#39;t I=
 have to compute all<br>
&gt; 2^31 possible public child addresses?<br>
<br>
</span>Which would take a quad core laptop about 8 hours with competent sof=
tware<br>
<br>
And presumably you&#39;re not using the whole 2^31 space else the receiver<=
br>
also has to do that computation...<br>
</blockquote></div><br></div>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">=
bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.org/mail=
man/listinfo/bitcoin-dev</a><br>
</blockquote></div></div>

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