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-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1UzSNu-0008Ex-T9 for bitcoin-development@lists.sourceforge.net; Wed, 17 Jul 2013 14:07:15 +0000 X-ACL-Warn: Received: from mail-ee0-f49.google.com ([74.125.83.49]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1UzSNp-0004Bf-Th for bitcoin-development@lists.sourceforge.net; Wed, 17 Jul 2013 14:07:14 +0000 Received: by mail-ee0-f49.google.com with SMTP id b57so1070446eek.22 for ; Wed, 17 Jul 2013 07:07:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=sender:subject:mime-version:content-type:from:in-reply-to:date:cc :message-id:references:to:x-mailer:x-gm-message-state; bh=uj0g5jRBeEztuJC+W4vfBW4j06boKzUgcrEs35YydD4=; b=WkoBzx/emlao5/9DTWPxNZsZvdi3HYMfp7qGJx/1+E6qGC5Hm3DKeBz2bAAlKZOscu F1GqV0/rj5uXHMlkZQ+XJV7VDSoFiYDa5+m2Ekh5bZ7mS2h5hRb6u4NDX+CVWdqIlMLZ +Gd+EHlCL425MAoSofAmtiDKuEASSmZ/0IjDqZEE/6Uv4ia7N0q4olq/W+pMYdruzqg1 YQKNDqsAzRUBozbJmbA5j7767mwVotZ2MUzCGR3yfjppAUlIFMLPMV1JjeNSPQu0gXMp P98A1DAJ2OriRSeIM+NxKNLqWC1fOZYIGJV/yq+T8g9Qr9KbpL86opwnCg5izVk1TKVO rd8g== X-Received: by 10.15.90.139 with SMTP id q11mr6544377eez.137.1374070023106; Wed, 17 Jul 2013 07:07:03 -0700 (PDT) Received: from [127.0.0.1] ([180.149.96.170]) by mx.google.com with ESMTPSA id n5sm11057945eed.9.2013.07.17.07.06.57 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 17 Jul 2013 07:07:02 -0700 (PDT) Sender: w grabhive Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/signed; boundary="Apple-Mail=_1021365A-1C80-4E71-8585-29CBD4A47804"; protocol="application/pgp-signature"; micalg=pgp-sha1 From: Wendell In-Reply-To: <20130717105853.GA10083@savin> Date: Wed, 17 Jul 2013 15:37:41 +0200 Message-Id: <3DB67FAF-E113-47FE-9043-C22D0F5A4F4A@grabhive.com> References: <3E7894A0-06F3-453D-87F8-975A244EBACF@include7.ch> <2BDA0943-22BB-4405-9AF0-86FB41FD04A6@include7.ch> <2F20A509-13A9-4C84-86D7-A15C21BACD53@include7.ch> <2A1C412D-414E-4C41-8E20-F0D21F801328@grabhive.com> <8EE501AA-1601-4C28-A32E-80F17D219D3A@grabhive.com> <20130717105853.GA10083@savin> To: Peter Todd X-Mailer: Apple Mail (2.1283) X-Gm-Message-State: ALoCoQnjF9Zv+CTUBbGSHCjvYY5YxiYZIIMTm5hKho22LbVAtcRkyqKkX7PezyN1xFFSYGqj/iJT X-Spam-Score: 1.9 (+) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 1.2 RCVD_IN_BL_SPAMCOP_NET RBL: Received via a relay in bl.spamcop.net [Blocked - see ] 0.6 RCVD_IN_SORBS_WEB RBL: SORBS: sender is an abusable web server [180.149.96.170 listed in dnsbl.sorbs.net] X-Headers-End: 1UzSNp-0004Bf-Th Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] SPV bitcoind? (was: Introducing BitcoinKit.framework) 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, 17 Jul 2013 14:07:15 -0000 --Apple-Mail=_1021365A-1C80-4E71-8585-29CBD4A47804 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Peter, This sounds like a _very_ good idea for a desktop client, and probably = acceptable to users so long as we take available disk space into = consideration, and only ever use a fraction of it. Will you implement this? -wendell grabhive.com | twitter.com/grabhive On Jul 17, 2013, at 12:58 PM, Peter Todd wrote: > So what's useful about that? Basically it means your node starts with > the same security level, and usefulness to the network, as a SPV node. > But over time you keep downloading blocks as they are created, and = with > whatever bandwidth you have left (out of some user-configurable > allocation) you download additional blocks going further and further > back in time. Gradually your UTXO set becomes more complete, and over > time you can verify a higher and higher % of all valid transactions. > Eventually your node becomes a full node, but in the meantime it was > still useful for the user, and still contributed to the network by > relaying blocks and an increasingly large subset of all transactions. > (optionally you can store a subset of the chain history too for other > nodes to bootstrap from) You've also got better security because you > *are* validating blocks, starting off incompletely, and increasingly > completely until your finally validating fully. Privacy is improved, = for > both you and others, by mixing your transactions with others and = adding > to the overall anonymity set. >=20 > In the future we'll have miners commit a hash of the UTXO set, and = that > gives us even more options to, for instance, have relayed transactions > include proof that their inputs were valid, allowing all nodes to = relay > them safely. --Apple-Mail=_1021365A-1C80-4E71-8585-29CBD4A47804 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.18 (Darwin) iQIcBAEBAgAGBQJR5p4lAAoJECAN2ykHU5Y6saYP/2QKxgQ/zAsWZLzTnD3DjUbH mxji99mwHGp23/AJ3ROkuRHX/tX2hCqX3sT9x+ftlpjds1QuPHDBc10P3JR7+yO4 30PJ5IabiU2NEvDxqgk7LVNim0D0ffGgtOKykEVL+smAN/l5ghM6fonNrGw3+hmh BSU1Q4w+T02AIyfIAusCQr2PeaYVPu8OE5vX+TlJtHUrDJSuOSRDEP175XT8P6zJ eDnEKJmUjAzbKliSoUERM6afufBr5l3J7VNBBScpkICt8C85LGZ8wGa942zfe32W 6pPPcaZyuX8MCY3utc6Eludzrk/BgVHklg/K+8W1fiPuMH4E4q6POaf9EEdGAJBJ 4TKGO4mMsT/Dt3vzt7/x/Ql05qIz+NMi3rA5M48sZ6nMGNFmtwDu25sNqYWzGzc/ fgAwuKkTi9ltLG9r7loyQW7/f7HOxe3qzgO1wHH43kIgLEifneptllTIUHTZjIAO DT5fY5P4IkZgDMq1EpYjD1Ia1evamCPem2j6NQtD+0vznG0+z7lLemVePBqZKFgO Db5NepL19hChUHru0Rt0g70ZTm3OyZVnmlQZClHo2AQFcldJ++rxpXYZWW7kLECZ y+Xb2QSj31X5mr3zDeEgF/ESNaYjF2TyVa9vl20RTUisancbXsHxQQwXTAek2hRN 0vXuT9qMU6coO+ZMtwPd =k8+F -----END PGP SIGNATURE----- --Apple-Mail=_1021365A-1C80-4E71-8585-29CBD4A47804--