Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 6CFBCBAF for ; Thu, 7 Sep 2017 16:37:22 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mail.sldev.cz (mail.sldev.cz [51.254.7.247]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 0239E3F9 for ; Thu, 7 Sep 2017 16:37:21 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mail.sldev.cz (Postfix) with ESMTP id 8E834E5A3; Thu, 7 Sep 2017 16:57:34 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.sldev.cz Received: from mail.sldev.cz ([127.0.0.1]) by localhost (mail.sl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SHZH48T_O0pe; Thu, 7 Sep 2017 16:57:34 +0000 (UTC) Received: from tetra.site (unknown [10.8.8.107]) by mail.sldev.cz (Postfix) with ESMTPSA id 25465E2C6; Thu, 7 Sep 2017 16:57:34 +0000 (UTC) To: Kabuto Samourai References: <0d405f5d-c0a4-bad7-b6c3-08ba4424bf17@satoshilabs.com> <200b706a-f6ac-479a-2dce-fd66fe943949@satoshilabs.com> From: Pavol Rusnak Message-ID: <7bf726e1-f4e2-8d68-f934-671a0f2b9033@satoshilabs.com> Date: Thu, 7 Sep 2017 18:37:19 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=disabled version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: Bitcoin Protocol Discussion Subject: Re: [bitcoin-dev] Proposal: Extended serialization format for BIP-32 wallets 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: Thu, 07 Sep 2017 16:37:22 -0000 On 07/09/17 18:30, Kabuto Samourai wrote: > Why not make this block height, rather than a timestamp? Blockheight depends on the chain. XPUB is not tied to particular chain/coin. Also there are already cryptocurrencies that do not use blockchain, but directed acyclic graph (DAG) for storing transactions. So it would not be obvious what number to use as a blockheight. OTOH all blockchains contain timestamps in their blocks, so we can use that. -- Best Regards / S pozdravom, Pavol "stick" Rusnak CTO, SatoshiLabs