From: Jonas Schnelli <dev@jonasschnelli.ch>
Message-Id: <B27FF856-9281-479C-BFE2-D594F46C5C44@jonasschnelli.ch>
Content-Type: multipart/signed;
	boundary="Apple-Mail=_25D5C8B6-1CC1-4A3C-A293-6875C629364E";
	protocol="application/pgp-signature"; micalg=pgp-sha256
Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\))
Date: Mon, 19 Jun 2017 18:22:03 +0200
In-Reply-To: <oi8sdn$ksl$1@blaine.gmane.org>
To: Andreas Schildbach <andreas@schildbach.de>
References: <CAO3Pvs8ccTkgrecJG6KFbBW+9moHF-FTU+4qNfayeE3hM9uRrg@mail.gmail.com>
	<oi8e8k$g56$1@blaine.gmane.org>
	<537fb7106e0387c77537f0b1279cbeca@cock.lu>
	<55482016.LADLl5KXAH@strawberry>
	<4052F361-966C-4817-9779-146D4B43D1FE@jonasschnelli.ch>
	<oi8sdn$ksl$1@blaine.gmane.org>
Cc: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] BIP Proposal: Compact Client Side Filtering for
 Light Clients
Precedence: list


--Apple-Mail=_25D5C8B6-1CC1-4A3C-A293-6875C629364E
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=utf-8

>=20
> On the other hand, I remember only 1 (one) inquiry about the privacy
> problems of BIP37 (or privacy at all).

IMO privacy its something developers should make sure users have it.
Also, I think, todays SPV wallets should make users more aware of the =
possible privacy implications.

Do users know, if they pay for a good in a shop while consuming the =
shops WIFI, that the shop-owner as well as the ISP can use that data to =
combine it with the user profile (and ~ALL FUTURE purchases you do with =
the same wallet IN ANY LOCATION online or in-person)?

Do users know, that ISPs (cellular; including Google) can completely =
link the used Bitcoin wallet (again: all purchase including future ones) =
with the to the ISP well known user profile including credit-card data =
and may sell the Bitcoin data to any other data mining company?

If you use BIP37, you basically give your transaction history (_ALL =
TRANSACTIONS_ including transactions in future) to everyone.


>=20
> =46rom a regular user's point of view, privacy is non-issue. Sure,
> everyone would take it for free, but certainly not if it a) delays
> incoming payments or b) quickly eats up your traffic quota.

This may be true because they are not aware of the ramification and I =
don=E2=80=99t think client side filtering is a drop-in replacement for =
todays, smartphone SPV-model.


/jonas

--Apple-Mail=_25D5C8B6-1CC1-4A3C-A293-6875C629364E
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
	filename=signature.asc
Content-Type: application/pgp-signature;
	name=signature.asc
Content-Description: Message signed with OpenPGP

-----BEGIN PGP SIGNATURE-----
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=bMyz
-----END PGP SIGNATURE-----

--Apple-Mail=_25D5C8B6-1CC1-4A3C-A293-6875C629364E--