From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1V1HBN-0004Qv-B4 for bitcoin-development@lists.sourceforge.net; Mon, 22 Jul 2013 14:33:49 +0000 Received-SPF: pass (sog-mx-1.v43.ch3.sourceforge.com: domain of me.com designates 17.172.220.240 as permitted sender) client-ip=17.172.220.240; envelope-from=jeanpaulkogelman@me.com; helo=st11p02mm-asmtp005.mac.com; Received: from st11p02mm-asmtpout005.mac.com ([17.172.220.240] helo=st11p02mm-asmtp005.mac.com) by sog-mx-1.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1V1HBK-0003re-48 for bitcoin-development@lists.sourceforge.net; Mon, 22 Jul 2013 14:33:49 +0000 Received: from [10.0.1.7] (216-19-182-8.dyn.novuscom.net [216.19.182.8]) by st11p02mm-asmtp005.mac.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Jan 3 2012)) with ESMTPSA id <0MQC00J3WDRXC1C0@st11p02mm-asmtp005.mac.com> for bitcoin-development@lists.sourceforge.net; Mon, 22 Jul 2013 14:33:35 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.10.8794,1.0.431,0.0.0000 definitions=2013-07-22_03:2013-07-19, 2013-07-22, 1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=6.0.2-1305010000 definitions=main-1307220092 References: MIME-version: 1.0 (1.0) In-reply-to: Content-type: text/plain; charset=us-ascii Content-transfer-encoding: quoted-printable Message-id: <058CED37-646C-4978-8026-8EF3868F17A7@me.com> X-Mailer: iPhone Mail (10B329) From: Jean-Paul Kogelman Date: Mon, 22 Jul 2013 07:33:34 -0700 To: Mike Hearn X-Spam-Score: -1.5 (-) 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 SPF_PASS SPF: sender matches SPF record X-Headers-End: 1V1HBK-0003re-48 Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] [RFC] Proposal: Base58 encoded HD Wallet master seed with optional encryption 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: Mon, 22 Jul 2013 14:33:49 -0000 Hi Mike, I had a similar request on the forums. I suggested adding either a 2 byte 'w= eeks since genesis' or 'months since genesis', but starting from spec birth w= orks too. Would either of those work for you? jp On Jul 22, 2013, at 6:14 AM, Mike Hearn wrote: > This isn't usable for SPV wallets unless it has a birthday in it. Otherwis= e you either need to scan the entire chain (slow) or find a fully indexed co= py of the block chain (expensive, more centralised). Just add a UNIX time as= an extra 4 bytes, or if you want to save a few characters then use a uint16= that represents "days since birth of this specification".