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From: Erik Aronesty <erik@q32.com>
To: Gregory Maxwell <greg@xiph.org>
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP Number Request: Addresses over Audio
Date: Fri, 12 Aug 2016 08:36:31 -0400	[thread overview]
Message-ID: <CAJowKgJBHq4YL47A5Ms=NhFL_uETBB7Q+XjETpAS=9o8EoSJMQ@mail.gmail.com> (raw)
In-Reply-To: <CAAS2fgTrUKvG9Eff6jNhtKfiV9v8oMDsEA9rJaViYsw50Ub5sA@mail.gmail.com>

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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...
>

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  reply	other threads:[~2016-08-12 12:36 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-08 21:22 [bitcoin-dev] BIP Number Request: Addresses over Audio Daniel Hoffman
2016-08-08 22:06 ` Justin Newton
2016-08-08 22:35   ` Daniel Hoffman
2016-08-08 22:59   ` Trevin Hofmann
2016-08-09  1:50     ` Daniel Hoffman
2016-08-09 23:06       ` Daniel Hoffman
2016-08-10  0:17         ` Jannes Faber
2016-08-10  0:27         ` Chris Riley
2016-08-10  0:36         ` Luke Dashjr
2016-08-10  1:09         ` Thomas Daede
2016-08-10  1:53           ` Daniel Hoffman
2016-08-10  2:14         ` Gregory Maxwell
2016-08-10 10:41           ` Tier Nolan
2016-08-10 11:42             ` Erik Aronesty
2016-08-10 11:49               ` Theo Chino
2016-08-10 16:01                 ` Daniel Hoffman
2016-08-10 17:28                   ` Erik Aronesty
2016-08-10 17:38                     ` Pieter Wuille
2016-08-10 17:55                       ` Daniel Hoffman
2016-08-10 22:31                         ` James MacWhyte
2016-08-11 13:55                       ` Erik Aronesty
2016-08-11 15:13                         ` Tier Nolan
2016-08-11 20:37                           ` Erik Aronesty
2016-08-12  0:36                             ` Gregory Maxwell
2016-08-12 12:36                               ` Erik Aronesty [this message]
2016-08-12 15:49                                 ` Jorge Timón
2016-08-12 18:39                                 ` James MacWhyte
2016-08-13  4:41                                   ` Daniel Hoffman

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