diff options
| author | Alistair Mann <al@pectw.net> | 2019-08-01 00:28:56 +0100 |
|---|---|---|
| committer | bitcoindev <bitcoindev@gnusha.org> | 2019-07-31 23:28:59 +0000 |
| commit | 31e8ca58420045d25f31b7262e0a55d64465ba07 (patch) | |
| tree | 8641c54fa3ca2e4f85e09ba325d470bea0e16428 /a9 | |
| parent | dde861b69d7c76c1e3914c59184b469f8f48c7d6 (diff) | |
| download | pi-bitcoindev-31e8ca58420045d25f31b7262e0a55d64465ba07.tar.gz pi-bitcoindev-31e8ca58420045d25f31b7262e0a55d64465ba07.zip | |
Re: [bitcoin-dev] Add a moving checkpoint to the Bitcoin protocol
Diffstat (limited to 'a9')
| -rw-r--r-- | a9/8a4a2bda666e46b2ca456a7309b34d55e6a235 | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/a9/8a4a2bda666e46b2ca456a7309b34d55e6a235 b/a9/8a4a2bda666e46b2ca456a7309b34d55e6a235 new file mode 100644 index 000000000..0f1749aaf --- /dev/null +++ b/a9/8a4a2bda666e46b2ca456a7309b34d55e6a235 @@ -0,0 +1,100 @@ +Return-Path: <al@pectw.net> +Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org + [172.17.192.35]) + by mail.linuxfoundation.org (Postfix) with ESMTPS id E5E2B4264 + for <bitcoin-dev@lists.linuxfoundation.org>; + Wed, 31 Jul 2019 23:28:59 +0000 (UTC) +X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 +Received: from pectw.vm.bytemark.co.uk (pectw.vm.bytemark.co.uk [80.68.92.123]) + by smtp1.linuxfoundation.org (Postfix) with ESMTP id EC4417ED + for <bitcoin-dev@lists.linuxfoundation.org>; + Wed, 31 Jul 2019 23:28:57 +0000 (UTC) +DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=pectw.net; + s=dkim_test; + h=Content-Type:Content-Transfer-Encoding:MIME-Version: + References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To: + Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: + Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: + List-Subscribe:List-Post:List-Owner:List-Archive; + bh=dnG3/LW7sal9PcyiMWK4N8UiVvRSgSMZMCAeVMB0B14=; + b=XXYB8xpuE7DQubqvdLLMOgkQpu + csKAV+4DQlXznks3+b0Y41P43LpfLSzw421bVAXB+CqfDHKbaFe1rArYMaydrf93p2mMQkKku2pYj + QVUsvxC9So078NU0z0q3D0OQK; +Received: from host109-153-202-196.range109-153.btcentralplus.com + ([109.153.202.196] helo=svetlana.localhost) + by pectw.vm.bytemark.co.uk with esmtpsa + (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) + (envelope-from <al@pectw.net>) + id 1hsy1h-0000u4-3E; Wed, 31 Jul 2019 23:28:57 +0000 +From: Alistair Mann <al@pectw.net> +To: "Kenshiro []" <tensiam@hotmail.com> +Date: Thu, 01 Aug 2019 00:28:56 +0100 +Message-ID: <2084819.YBhD99MD1N@dprfs-d5766> +User-Agent: KMail/4.14.2 (Linux/4.4.0-18-generic; KDE/4.14.2; x86_64; ; ) +In-Reply-To: <DB6PR10MB183271245AAE84FB9AC96474A6DF0@DB6PR10MB1832.EURPRD10.PROD.OUTLOOK.COM> +References: <DB6PR10MB1832329BC8D151DC18F1E6CEA6DF0@DB6PR10MB1832.EURPRD10.PROD.OUTLOOK.COM> + <DB6PR10MB1832F1E966CD83BC662985BDA6DF0@DB6PR10MB1832.EURPRD10.PROD.OUTLOOK.COM> + <DB6PR10MB183271245AAE84FB9AC96474A6DF0@DB6PR10MB1832.EURPRD10.PROD.OUTLOOK.COM> +MIME-Version: 1.0 +Content-Transfer-Encoding: 7Bit +Content-Type: text/plain; charset="us-ascii" +X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, + DKIM_VALID,DKIM_VALID_AU autolearn=ham version=3.3.1 +X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on + smtp1.linux-foundation.org +X-Mailman-Approved-At: Thu, 01 Aug 2019 02:12:47 +0000 +Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org> +Subject: Re: [bitcoin-dev] Add a moving checkpoint to the Bitcoin protocol +X-BeenThere: bitcoin-dev@lists.linuxfoundation.org +X-Mailman-Version: 2.1.12 +Precedence: list +List-Id: Bitcoin Protocol Discussion <bitcoin-dev.lists.linuxfoundation.org> +List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/bitcoin-dev>, + <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=unsubscribe> +List-Archive: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/> +List-Post: <mailto:bitcoin-dev@lists.linuxfoundation.org> +List-Help: <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=help> +List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev>, + <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=subscribe> +X-List-Received-Date: Wed, 31 Jul 2019 23:29:00 -0000 + +On Wednesday 31 Jul 2019 14:53:25 Kenshiro [] wrote: +>> How would a (potentially, state-sponsored) netsplit lasting longer than +>> N be handled? +> +> It would be detected by the community much before reaching the reorg limit +> of N blocks (it's 24 hours) so nodes could stop until the netsplit is +> fixed. + +A netsplit cannot be detected but merely be suspected where the p2p protocol +does allow arbitrary connecting/disconnecting of any peer: there's no +difference between a remote net being split off, that net having nothing to +say, and that net choosing to disconnect. Detection then mandates manual, out- +of-band communications, which is error prone and centralising. + +I also observe 'stopping nodes' during netsplits introduces several attack +vectors. Among them: create a netsplit, which stops the nodes, turn off the +netsplit, repeat. A sequence of 365 actors causing their own small netsplits +could effectively stop Bitcoin at the cost (to them) of no Internet for one +day a year as the rolling netsplit could never be fixed. + +> In the extreme case no one notice the network split during more than N +> blocks (24 hours) and there are 2 permanent forks longer than N, nodes from +> one branch could delete their local history so they would join the other +> branch. +> +> P.S.: To be clearer, in this example I set an N value of 144 blocks, which +> is approximately 24 hours. + +I've seen estimates of China hosting more than 51% of hashpower. Say they +conduct a netsplit. Does your suggestion mean that it's the rest of the world +that has to delete their local history because they lack the hashpower to +assert themselves as the proper branch? If so, I think having to delete actual +history everywhere across the globe but China is not a price worth paying to +limit reorgs to 24 hours. + +I am unconvinced that the moving checkpoint you describe would improve +Bitcoin. +-- +Alistair Mann + |