From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WXwZj-0003c6-6r for bitcoin-development@lists.sourceforge.net; Wed, 09 Apr 2014 17:46:15 +0000 Received-SPF: pass (sog-mx-3.v43.ch3.sourceforge.com: domain of petertodd.org designates 62.13.148.96 as permitted sender) client-ip=62.13.148.96; envelope-from=pete@petertodd.org; helo=outmail148096.authsmtp.net; Received: from outmail148096.authsmtp.net ([62.13.148.96]) by sog-mx-3.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1WXwZi-0007E6-1r for bitcoin-development@lists.sourceforge.net; Wed, 09 Apr 2014 17:46:15 +0000 Received: from mail-c235.authsmtp.com (mail-c235.authsmtp.com [62.13.128.235]) by punt17.authsmtp.com (8.14.2/8.14.2/) with ESMTP id s39Hk6pQ098480; Wed, 9 Apr 2014 18:46:06 +0100 (BST) Received: from [25.121.248.92] ([24.114.49.14]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id s39Hk3at074470 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 9 Apr 2014 18:46:05 +0100 (BST) User-Agent: K-9 Mail for Android In-Reply-To: References: <53456B99.9010207@monetize.io> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 From: Peter Todd Date: Wed, 09 Apr 2014 13:46:00 -0400 To: Tamas Blummer , Mark Friedenbach Message-ID: <00b77560-d7ed-4ed4-a4e5-eb1f00467a06@email.android.com> X-Server-Quench: d3560bac-c00e-11e3-b802-002590a15da7 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aQdMdgsUGUUGAgsB AmIbWlxeVFt7WWY7 aQ5PbARZfE5HQQRu T0xPR01TWkZrCGRa BU9aUh52cwJGNn9w ZUJqECRYWUJ6Jxcu Xx1UFTgbZGY1a31N WEBaagNUcgZDfk5E bwQuUz1vNG8XDQg5 AwQ0PjZ0MThBJSBS WgQAK04nCWwKAjU7 RhYOWDQpWEcMTCY8 NRs7LFJUGUEdPw08 NkFpYmomUgAbDglT A1ol X-Authentic-SMTP: 61633532353630.1023:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 24.114.49.14/465 X-AuthVirus-Status: No virus detected - but ensure you scan with your own anti-virus system. 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: 1WXwZi-0007E6-1r Cc: bitcoin-development@lists.sourceforge.net Subject: Re: [Bitcoin-development] Bitcoind-in-background mode for SPV wallets 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: Wed, 09 Apr 2014 17:46:15 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 9 April 2014 12:27:13 GMT-04:00, Tamas Blummer wrote: >A border router that is not able to serve blocks is still protecting >consensus rules, that SPVs do not. >If the network would only consist of SPV nodes only then e.g. a >majority coalition of miner could increase their reward at will. > >Archives need a different solution. Any collective group that has a majority of hashing power will have no major issues running enough nodes that follow their rules to make SPV insecure anyway. There's no good reason not to have SPV security nodes distribute block chain data, particularly block headers. It helps provide redundancy in the network topology and helps provide more resources for full nodes to sync up faster. For instance in a network with a large number of partial UTXO set nodes if those nodes are forwarding block data to each other they can get enough data to become fully fledged full nodes without putting all the load on the existing full nodes. This is a good thing. -----BEGIN PGP SIGNATURE----- Version: APG v1.1.1 iQFQBAEBCgA6BQJTRYdYMxxQZXRlciBUb2RkIChsb3cgc2VjdXJpdHkga2V5KSA8 cGV0ZUBwZXRlcnRvZGQub3JnPgAKCRAZnIM7qOfwhdwRB/46MAw7OHwnVkLHOD0g Y4X6p1/QHgRisJIgpG2Y4nGVeAjOFleQWe4PWS4Wwdr4u0BDGPmJompiR3A99CaL MUPnxJhtdiUsomn6kI704f5pkrqslQGLzejWFb7/9WuQtvGm8RwnzIs7uAqKasni KJMn3jmqFIUcCEy9dePUdmMySCQj8qSxjGDdwZnwf8BZSdSLqd8dYiN0jQi/aA1I 2hWWyyDK9V9yQ8peAg+1dfg754Tc76lj3mEQOD39Wu3Klb9mBF3+wQCW2tJYEj2E stzeOdFZsUNUIOKFb6mo0IoUipPOvrAkfm91ais+FIwlCf+k5KcwmAUXpV45rLHm egCr =2vMf -----END PGP SIGNATURE-----