diff options
author | Braydon Fuller <braydon@purse.io> | 2019-10-16 12:07:25 -0700 |
---|---|---|
committer | bitcoindev <bitcoindev@gnusha.org> | 2019-10-16 19:07:29 +0000 |
commit | 771c99fa1eb6c7b28387880683a483fd37c17397 (patch) | |
tree | 8dfd87c5a601f73ba8316e2ea6b2e850f834f8b5 | |
parent | 70b386a77016b18148a1d0f37bee866f77211a66 (diff) | |
download | pi-bitcoindev-771c99fa1eb6c7b28387880683a483fd37c17397.tar.gz pi-bitcoindev-771c99fa1eb6c7b28387880683a483fd37c17397.zip |
Re: [bitcoin-dev] Chain width expansion
-rw-r--r-- | 84/b08892e43211fcd5a92c4667d531e72a7badac | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/84/b08892e43211fcd5a92c4667d531e72a7badac b/84/b08892e43211fcd5a92c4667d531e72a7badac new file mode 100644 index 000000000..41871bef8 --- /dev/null +++ b/84/b08892e43211fcd5a92c4667d531e72a7badac @@ -0,0 +1,163 @@ +Return-Path: <braydon@purse.io> +Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org + [172.17.192.35]) + by mail.linuxfoundation.org (Postfix) with ESMTPS id 0A5D4408 + for <bitcoin-dev@lists.linuxfoundation.org>; + Wed, 16 Oct 2019 19:07:29 +0000 (UTC) +X-Greylist: whitelisted by SQLgrey-1.7.6 +Received: from mail-pl1-f171.google.com (mail-pl1-f171.google.com + [209.85.214.171]) + by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 0CA078A7 + for <bitcoin-dev@lists.linuxfoundation.org>; + Wed, 16 Oct 2019 19:07:27 +0000 (UTC) +Received: by mail-pl1-f171.google.com with SMTP id d22so11716676pls.0 + for <bitcoin-dev@lists.linuxfoundation.org>; + Wed, 16 Oct 2019 12:07:27 -0700 (PDT) +DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=purse.io; s=google; + h=subject:to:references:from:openpgp:autocrypt:message-id:date + :user-agent:mime-version:in-reply-to:content-transfer-encoding + :content-language; + bh=mkm35w217W8YeCU/Xv9Ev1YgZsTbVsuxUpS3xVC+rT0=; + b=VZUfc8HdYE5ppe2YwHFu3xns1uZIOleJYzIuYfY3kzDPXOsLWiE22FBRHz1guPvpiB + MnXIH44X1BLFh8s6Q1jduTHpNcaaRco7Z241sMbqOUMxgIwumtaS8UE8Z3xSEZb94PCY + fzD+5zSsXym1qCfyHH+kaHSCuJ+OYqJpyrRCY= +X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; + d=1e100.net; s=20161025; + h=x-gm-message-state:subject:to:references:from:openpgp:autocrypt + :message-id:date:user-agent:mime-version:in-reply-to + :content-transfer-encoding:content-language; + bh=mkm35w217W8YeCU/Xv9Ev1YgZsTbVsuxUpS3xVC+rT0=; + b=RKQZUCFWShWtjfmjyZSVSAXx0tvZhZ9WKja090d+10nCU6uX+W/Szo38RNWnlaPyqP + B2OhHYEKBHl6m+PcjYClsbgcRoueaUEac5WJjLBozvCVDWMfVCxQeGZcPKfasU6MO5LS + XEko0CcwfN4UHFct+otsQTYO3uag5s81W/Hto7dxUrRLMJchO0ZBkTKEvMO/uTRD6zD8 + vKh+bkNGVCltT07fuK3xf/RmBVCFWqQC6uoiluQr9g/j66YTN1Ja2gwa9kSltYtZVPw+ + 1D+Yjr3lNrl6lj1FINzkL6GMTX9M69FoFWymR+bDywCMpRdiBzmYSR5LWecYNRuBDBRV + /NNA== +X-Gm-Message-State: APjAAAVHCBunAHRvV2AdCSvnlWt9pDGN1h3Z59fO1NVQhG2hsZZwYnvM + 7pvdyrOlmwb3gIobgToc3OmKjm4sLYU= +X-Google-Smtp-Source: APXvYqzG35DLu7yt0DDAw5X6hFWDyKnYv3bHzBtYg97Kdey9ol6g6f1OjveWZWUN6NCLj2Ifz/uDig== +X-Received: by 2002:a17:902:ab89:: with SMTP id + f9mr42425769plr.295.1571252847128; + Wed, 16 Oct 2019 12:07:27 -0700 (PDT) +Received: from [10.0.0.199] ([198.244.101.193]) + by smtp.gmail.com with ESMTPSA id + w2sm16134087pgr.78.2019.10.16.12.07.26 + (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); + Wed, 16 Oct 2019 12:07:26 -0700 (PDT) +To: Tier Nolan <tier.nolan@gmail.com>, + Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org> +References: <42cd5ffd-63e8-b738-c4ea-13d0699b1268@purse.io> + <CAE-z3OV_LL+Jww3e=gO6t=02VW7m9PK+8EaYoEVLy9NKNMiSaQ@mail.gmail.com> + <e9c5e519-ea8a-f0e2-d8fb-c955b5c2de40@purse.io> + <CAE-z3OXyTc0aoJJVNLS5MReE7+Nhckyrjf22+yCSjXF8=bNbXQ@mail.gmail.com> + <H_Yq1W3SffFweLPPXiUiA4EeU2yU7c8LVcqw5AbajovWTWMt5hKQARKglEQwCjPpXvjiBfvmTnaXJwivkGkT8BDha8k303DNbFB-ECes0d4=@protonmail.com> + <CAE-z3OVqU5n8H9vKj9Pn7k80guMTsxt_CkN9qwpfCK8HB4PDgQ@mail.gmail.com> +From: Braydon Fuller <braydon@purse.io> +Openpgp: preference=signencrypt +Autocrypt: addr=braydon@purse.io; keydata= + xsFNBFsEkasBEAC4oPJQsFWAM0OjNJlYUxJbTV8bo1TgXwZdNZWewG6fvQQ+iGGImy/a5h10 + /9V+/Ctio8ayAfpk6V3z/vxq8IdPVcsWccHLnguaAEEhYnKdGZfsohcQMO4LR63R6vPrUYUJ + ehVzt2YZ5F495iRDKwbQLXbmXF9vLtaKuf/6hbVmlG7bM59eVKcvpE8EKm95Lpw+CBE3uKc3 + RxTcKHgo6QrkClm19GNDDkmHxM/k+hGT3M+sXGhgpL2940AGKsXuTPghgLQ+5seBWtzuWV31 + Uf0ltHx6Ks1w0mlgZZ+u4wlljMHIBKLr4cYDOF8AYxyVcPzuQLdRjIIKEgpMDQW7ftbgGM/q + hgGg2mN036KTUfT1HkmT82Z3D3z4ACJ/bY/J+mJw0baqcJpezndd1M6dnDNF9Slst2Mr+Loe + JdN1tY5kk6/OWwAI5L15hmdiRWUBryJqun7sy23cmVPSOrtaIfl7/SEFJ+MuXbK53+mFGT2P + CpdRzV4MrKr9qbBaXkkhvEfoL2z6VwIFBprqZjthPHcHR8r6QSTpZdsD+7+qoq2o4MDUqP54 + 5a3kGI3l6VW767VE/NUIocyO7Z9D/EZOCk22ElTLTCzWm0JvxxGJoalebLQcGey/A9WWGOv/ + ydwvTry3PWAzrrXNt43McHHwZXU4vSLnAtAxQy06Nt9wsWo+2QARAQABzSFCcmF5ZG9uIEZ1 + bGxlciA8YnJheWRvbkBwdXJzZS5pbz7CwZcEEwEIAEECGwMFCwkIBwIGFQgJCgsCBBYCAwEC + HgECF4ACGQEWIQRbfcWNkP7B6ZCjELryTyMtEIs61AUCXL9UPwUJA5v2FAAKCRDyTyMtEIs6 + 1HOwEACedBLpkYrFeLANxD25USZunMt4KA58ZkY7Ap2m7KFcxjZD07YIjtxJyMLhHhMz6pR7 + fF5BFHbl8CtAhpTuz5Sj9X3K0eilNsXvdx18+3RMUpFVAwlEEev707q6zNqKsRd1CG7e0k4o + 28YAgwbt42UIPUoKTcEpT4C51sDa5d4NZsGnFcXeEdpBSQVi56vap0eJrQTSFpV0sG497HNN + p96ErrGpqlOkTofcBeytpQbhH9kbP58PMABwU3tmoMFhT0kklPPZatv7RDLmC8cra5muXEwd + wv7ggauHbMbV3U1xZ/BNPwHm7jO1ygqR6Q4Y98miRUP4yH9SJsnr+q7bpD4yOUy/qP0Ve0Y0 + jFgX4e4DrnckO/2rG4lB2SbKiAWAOW5aGTnUAZt6agegXY62kHpuUHGcgYkeQqDWKLZWjFAA + vj8Gm5f+1thWk+4I0rFQBtaAoitd+qKPWFYSojjvKH4PLqoOV413qxZbrRlGxZb2TkJnxYpO + imOq/H6bHCnJUA8NI1v5rXmGQXfwhofMX9dHpGK864G+i59AX9L0EEQngDXZPlSEkyISaBY7 + JFBhuIPcY8MrhUkNWl1G2RcssjHeexmo2qNrKH4bWFF7xCCTmdGUSoHzaHDe/cIqmI0aRkqf + HQ4MpadD8flLLMqV/ODYfpSD3AuwM/m8Uj9nvfnMRs7BTQRbBJGrARAA3+SVdBJUThjPx/J5 + G4A1dd2vKVRRprW+pyJ0XDbNrRVOEnxr3okz2F4Htg72oULwsNcuCmgFxDlxIFMitzZAWbuL + fq9FR7snaW3PMlkj44eezq3emYXVv3C3lc6MudAOqkQKNzakyaA/6cNVlQnVmrpctpFHtUNi + oeivM9IeCP52scTH84qeRZofmnedc3FAxKMJ9OZi4Miigsd/DhzhUqbAePrCMlQQsM/HXSNs + 2qoMK3Bo6lcHzV7qyI9w19tmFouX06ULnAAM1dJZcCUL31FLtaIrGbcXA+99a8dlOUb68rj9 + 9H3V3zDjJscDBgJ2mziuuS/naG/NK+RVhVh3KqtViC62nGgA1tS1aLKZ7KDeyzu4FiE2bCPh + 6b4IlIQijzqwTyPJt+0Muf2FYxir9GwgMnVqJ/fYaT671RCcUrkq2krVzdHq/HX7A8Hyfftc + BMEt4yZJt/bZ7ryyWJ8PlQJP3HGqz+hpHmwrwmJgj5RbmktVMw3RAEipJrEHD1Q7wIhPNYpy + 6FIwFlDxwpUQOUYGEZYww9LRZiapN0FeDcFp6CUMRgJH24ZQzFk8J5N4PAzZrIZfQba71bDA + z3902PDt66qiIiG2muTbd8eIeCzx9RxWhDmQclzXn5WxfPU6l0E9NgLNFoNCppLaTz2S/Gxw + ZzrSduMLfVlhKPDjv2EAEQEAAcLBZQQYAQIADwUCWwSRqwIbDAUJAeEzgAAKCRDyTyMtEIs6 + 1MLqD/9vMXLRhe5w6oBKuL0tj+ChLhkQEM66Q7O4urWmvl8yf/ThNi0/LydGAYawCUWud2ph + aOg4vH0IUvUhlLDRcYc2MdfwJi8aj8G7YC/OUKwwFDfYyY9zIk1C5yXn6LigkjOL0PyYI0MM + 2gk64t/PK+Rny8jz6QjwZ4AMsoTpo698LSYS7LcvOETp+3yz0LYtkPP36FqoG2hudjh015Gk + DSIHWckot4TJXK8OOHOuKwUz2fteGsFeM4bmTiArCRXsAkRWo0VbA6hPinK0Zr/xLNSYIx94 + IXe5q9ISZc6ceuWyisVsUZxUgJJGyNSvXXwx4zoSS7BXyTo7syjpKd09nhCL3QGfuHugJ/1/ + DCaNtKUu2C+rUe1Ux6/qteCVUsAM+bDfDBQ/vS1tnyn9OVBTOZqXvChL4f+MAN2Wws/+Llxw + DqGMX6YC/ZBWM56XGApL1zj93nygxbN8s8yXqqMQNghTjwj9IqyaNQcKO/AslSmFlW6RXz1Y + RDT4mSKdAogbdDqmguGc05kUaOSkqSb0bL34iQ/dm4PyVxjSGSDRr8TQOjQGz0rSEh6Q+LZ9 + zRltkmEMkdkyWQZ4tYsBbQv2TU+tCfKMIUCZ7xEHuvjAKZIms9Ers3zVS+PcRr9i6mvMtbNM + ufP9MwSx7PqsHuv/PWdoI3uwanxYzk1GTLALMsy2icLBfAQYAQIAJgIbDBYhBFt9xY2Q/sHp + kKMQuvJPIy0QizrUBQJcv1RFBQkDm/YaAAoJEPJPIy0QizrUjvoP/R6Wi8Ol1QiOWrxLZyL9 + NYtU1Q+P46R8Q0d6gFRkrC9MKJlzaTRzPxdaWyJURnh1pXHbykB3/b6Bg/WN7o7Wips8KIhL + PzrNUiCZIsrBxUR29no7NzU6o7rSuu/9j5OfiyW/jViRJ3oi1jdYdFx7qx/56j1I54q6NHAk + i2AoG07RbXsRsh0x5vv4VIEFNwRRHmn/d185NTDeoVj9IanVhF6zna9M2iX3AgUOLovF7PiM + d/oF5XDwuzEDiBIorGi4WTqiCDjl7menb657af1DsPV68gKCiVFQNwfbawtUzUBasfaCFkR5 + NuXWFqYN/305vlK/IN2GDPrwwOFsQK9pG4fYDDC5Pi9fy9wLrwtlebRuraLCHsiho8mYtEhM + QTU7oQwWga9Ax6BXbnStmX1kEev41CEEvnaVtqzuT0VKJjnre/7z8+bRC1tbqvN5CKTQ1k3d + 5uwFqCBOxtoY6NLmYT37zFq34etKgpqCri6lEMtM57icMd4SPaADSXly/EyUTPbb/iGvQVOS + NFPpY30rTBA8rJJ5Iawe1OjG2dcYwKkFfGjGU7bbHp9ClG1d3YM7kDxVkgdIVAWhEY905HB4 + KXQZd0eW19JjNwLVMNzgBh07BiaXl16tWY+P7pQdPrbLctiIVqsYx+IU74M7riDEMTGjsosr + lL56VCOJffiN9F1L +Message-ID: <8d1e2696-0245-638a-61fa-8f79845136d5@purse.io> +Date: Wed, 16 Oct 2019 12:07:25 -0700 +User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 + Thunderbird/60.9.0 +MIME-Version: 1.0 +In-Reply-To: <CAE-z3OVqU5n8H9vKj9Pn7k80guMTsxt_CkN9qwpfCK8HB4PDgQ@mail.gmail.com> +Content-Type: text/plain; charset=utf-8 +Content-Transfer-Encoding: 8bit +Content-Language: en-US +X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, + DKIM_VALID, DKIM_VALID_AU, + RCVD_IN_DNSWL_NONE 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: Wed, 16 Oct 2019 19:45:31 +0000 +Subject: Re: [bitcoin-dev] Chain width expansion +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, 16 Oct 2019 19:07:29 -0000 + +On 10/12/19 1:46 PM, Tier Nolan via bitcoin-dev wrote: + +> On Sat, Oct 12, 2019 at 6:56 PM Joachim Strömbergson <joachimstr@protonmail.com> wrote: +>> On different note, one of the problems that I haven't seen mentioned here +>> yet is the timewarp attack. It is relevant to some of the proposed +>> solutions. It should be possible, IIRC, for a malicious node to generate +>> much longer chain with superslow timestamp increase (~5 blocks in 1 second) +>> without increasing difficulty (i.e. staying at min. diff.). This could +>> produce chain that is ~2500 times longer than main chain without having +>> multiple branches. +>> +> [..] +> +> The timewarp bug can be fixed by a basic soft fork. You just need to limit +> the maximum difference between the timestamp for the first header in a +> period and the last header in the previous period. + +Yeah, that makes sense as it corrects the off-by-one error. I think this +solution has been included in a draft proposal "The Great Consensus +Cleanup". It would need to be effective for not only the main chain but +also for any future forked chain. + + + |