Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id D02A9BCE for ; Wed, 4 Jan 2017 16:21:15 +0000 (UTC) X-Greylist: delayed 00:07:19 by SQLgrey-1.7.6 Received: from geekbox.info (geekbox.info [5.9.151.241]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id CCFF2152 for ; Wed, 4 Jan 2017 16:21:14 +0000 (UTC) Received: from [192.168.0.13] (46.128.114.214.dynamic.cablesurf.de [46.128.114.214]) (Authenticated sender: leo) by geekbox.info (Postfix) with ESMTPSA id 8C591DE0BCA for ; Wed, 4 Jan 2017 17:13:52 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=leowandersleb.de; s=mail; t=1483546432; bh=0jy2oX1U6WO/trUKi/AXg5bLiSKupU9VhSvbGjLWSPk=; h=Subject:To:References:From:Date:In-Reply-To; b=LET3xuz5GYfaEXHNltsuSOadgPzv4gviLHYhu52/BFCayA22YtSPRa7d6WNtDRHfa G+hbdFfp6MrGAWZGxHicv8NXus95zbBJdoNzCJrqeh3R1Iuq6QNpnsGu2g8WlUNjI0 8pliEyULK16I6+1p5+EKA562rrqq1PQ/Z2j7qT4s= To: bitcoin-dev@lists.linuxfoundation.org References: <71d822e413ac457a530e1c367811cc24@cock.lu> <77b6dd25-0603-a0bd-6a9e-38098e5cb19d@jonasschnelli.ch> <74aeb4760316b59a3db56c0d16d11f28@cock.lu> From: Leo Wandersleb Openpgp: id=FAE4D5168E9EF9F104AA1B2D6B9A1F0CB7C20812 X-Enigmail-Draft-Status: N1210 Message-ID: <32b76814-d702-56dc-97f4-d72da87e3cdd@LeoWandersleb.de> Date: Wed, 4 Jan 2017 17:13:41 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="PID93TblBTwVk69F4qNT3xo49Itgb6uXA" X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, T_DKIM_INVALID autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Wed, 04 Jan 2017 16:29:07 +0000 Subject: Re: [bitcoin-dev] Committed bloom filters for improved wallet performance and SPV security X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Jan 2017 16:21:16 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --PID93TblBTwVk69F4qNT3xo49Itgb6uXA Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 01/04/2017 12:06 AM, adiabat via bitcoin-dev wrote: > Also, if you're running a light client, and storing the filters the way= you > store block headers, there's really no reason to go all the way back to= height > 0. You can start grabbing headers at some point a while ago, before yo= ur set > of keys was generated. I think it'd be very worth it even with GB-scal= e disk > usage. The really great benefit of having this index is that you could implement= rather efficient cold wallet spending once the wallet has the full index. With Mycelium you can currently spend funds from a paper wallet or a BIP3= 9 sentence but at the cost of sharing all addresses with our servers. Schil= dbach would share addresses with random full nodes for hours or days to find fu= nds of a new private key with unknown creation date. With CBF it would still be = a matter of maybe minutes on a phone to identify relevant blocks and downlo= ad these but it would be very feasible to implement a private, cold storage spending feature. Also the index could be further partitioned by P2PKH, P2PK, P2SH, =85 Thi= s would lead to a very minor privacy leak for a reasonable reduction in index siz= e. --=20 Leo Wandersleb --PID93TblBTwVk69F4qNT3xo49Itgb6uXA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJYbR81AAoJEGuaHwy3wggSleAH/2Ch//5QUptDv+zr5K0dj4Xl D0Y7eUcKroSygsf0llOzQv0kCANDNNFub03BqVtbG3E3mkZBPVuYV/nIfjkyk39D Pxs6GWcHklmlolUuo+Eu/jwOhD5bORH4/7OKCgoaTGHu4U5FUi8Z1LBQ/ejlcRYV 9osCjhWxOvqIalE3HGWTPYzfyXgg6oBFOF+H4SayAmjoqHActK4SbFISsTTi1ocp 5jE46yl92bfQnE/ZSdBfB4U5CedT38veyU4J1VvVS73KKRT/PtGI2L7mTZc/0ihg CkHFGw2gdOALmQUb10pCFex/hyTvLTNdBjjVS8A2DrdmOZhX6w6cl6mBOI0fZ94= =8QSm -----END PGP SIGNATURE----- --PID93TblBTwVk69F4qNT3xo49Itgb6uXA--