From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WNOkX-0006zt-LE for bitcoin-development@lists.sourceforge.net; Tue, 11 Mar 2014 15:37:49 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of gmx.de designates 212.227.17.21 as permitted sender) client-ip=212.227.17.21; envelope-from=thomasv1@gmx.de; helo=mout.gmx.net; Received: from mout.gmx.net ([212.227.17.21]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:AES128-SHA:128) (Exim 4.76) id 1WNOkW-0003sf-Cp for bitcoin-development@lists.sourceforge.net; Tue, 11 Mar 2014 15:37:49 +0000 Received: from [192.168.1.27] ([84.101.32.222]) by mail.gmx.com (mrgmx102) with ESMTPSA (Nemesis) id 0LvzF3-1XFC6V0sCz-017iIS for ; Tue, 11 Mar 2014 16:37:42 +0100 Message-ID: <531F2DC6.3050502@gmx.de> Date: Tue, 11 Mar 2014 16:37:42 +0100 From: Thomas Voegtlin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: bitcoin-development@lists.sourceforge.net References: <531DFDF8.80008@gmail.com> <531E52FE.5090107@jerviss.org> <531E5454.1030601@gmail.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:6hLnFa0WscoayPiiCcRp9d1J5MMUf2iDoD9TRN9PjSU5kEY2O8h ivjPyfjY04+KSHLYQU+10S/rteu7JP3E+W4n5C+H38ickW02r6nkaW4h99ruIKLU1a7cpAn penkyt7NM51Ng2cClssdDlUcUFi1i/CKrH20CdXxnD0E2XPWS/EzoDjOSWdU6uhDtd0lp4k Z4g4px3JEhk4RJL1WX0gA== X-Spam-Score: -1.2 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (thomasv1[at]gmx.de) -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.227.17.21 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (thomasv1[at]gmx.de) X-Headers-End: 1WNOkW-0003sf-Cp Subject: Re: [Bitcoin-development] Multisign payment protocol? X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Mar 2014 15:37:49 -0000 > Trezor and Electrum may be earlier than this. Sorry for not joining the discussion earlier. I have postponed the release of bip32 features in Electrum due to ongoing discussions with Trezor and bitcoinj developers. I planned to post a summary in a separate thread, but this info is also relevant for this thread, so I'm posting here. (sorry if this is a bit offtopic, though) I plan to create a 2-factor authentication service that uses p2sh addresses in Electrum. All addresses are derived from the wallet root seed, and should be recoverable from it. (of course this departs from scenarios where master keys are generated independently; my opinion is that both should be possible) So, when the user activates 2fa protection, the root private key is deleted from their hard drive, as well as the master private key of one of the branches used to create p2sh addresses (which is sent to a remote server). See this (fairly old) description here for more details: https://bitcointalk.org/index.php?topic=274182.0 Since I still want to be able to generate 1of1 accounts after the 2fa protection is activated, 1of 1 accounts should not be generated directly from the root of the tree. Thus, an extra level must be inserted in the tree. For example, 1of1 addresses can be derived as follows: m/reserved'/n' where n is the account index, and "reserved" is an index that indicates the type of address. (0 would be reserved for 1of1 addresses) slush suggested that another layer of derivation would be useful, in order to use wallets with altcoins on the same seed. This lead to this type of derivation: m/coin'/reserved'/n' where "coin" would be 0 for Bitcoin, and "reserved" would be 0 for 1of1 addresses Thomas