1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
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=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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.
|
