Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of petertodd.org
	designates 62.13.149.101 as permitted sender)
	client-ip=62.13.149.101; envelope-from=pete@petertodd.org;
	helo=outmail149101.authsmtp.com; 
Date: Fri, 9 May 2014 11:43:13 -0400
From: Peter Todd <pete@petertodd.org>
To: Mike Hearn <mike@plan99.net>
Message-ID: <20140509154313.GA17107@savin>
References: <CANEZrP3VNXSc2cd3b9pz9iC2BR0-vG=tfYwMyUGBGaWPq+geXQ@mail.gmail.com>
	<20140509150325.GA30436@savin>
	<CANEZrP1m=-GWD5rLRe9vrx0JYKeKXghNw-a47ZbJTd1h3ngFww@mail.gmail.com>
	<20140509152715.GA12421@savin>
	<CANEZrP0Yom_JjN2PnPsfKV5S4wZSze4XTcJJU2ZWee4VGo20tw@mail.gmail.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha256;
	protocol="application/pgp-signature"; boundary="tThc/1wpZn/ma/RB"
Content-Disposition: inline
In-Reply-To: <CANEZrP0Yom_JjN2PnPsfKV5S4wZSze4XTcJJU2ZWee4VGo20tw@mail.gmail.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] ECDH in the payment protocol
Precedence: list


--tThc/1wpZn/ma/RB
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Fri, May 09, 2014 at 05:34:07PM +0200, Mike Hearn wrote:
> >
> > Ah, you're still misunderstanding my point: You can get atomicity in the
> > worst-case where the communications medium fails *and* stealth payments
> > that use up no extra space in the blockchain. This gives you the best of
> > both worlds.
>=20
>=20
> Sounds great! How does a lightweight client identify such transactions
> without any markers?

The exact same way you're proposing: via the payment protocol.

If something goes wrong and a payment gets lost, that's where you
implement a last-ditch "scan for stealth payments" button or similar
that either just asks a semi-trusted server to scan the blockchain for
you, or accepts the bandwidth hit and does so itself. (note that the
scan pubkey used to find payments is unable to spend those payments)

--=20
'peter'[:-1]@petertodd.org
000000000000000074d6fdc4442dae1b7273f77f2deec988daf63d3e1ec6eeea

--tThc/1wpZn/ma/RB
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.14 (GNU/Linux)
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==
=RFFn
-----END PGP SIGNATURE-----

--tThc/1wpZn/ma/RB--