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
|
Return-Path: <mark@friedenbach.org>
Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org
[172.17.192.35])
by mail.linuxfoundation.org (Postfix) with ESMTPS id A5169B8A
for <bitcoin-dev@lists.linuxfoundation.org>;
Fri, 22 Sep 2017 21:39:51 +0000 (UTC)
X-Greylist: whitelisted by SQLgrey-1.7.6
Received: from mail-pf0-f173.google.com (mail-pf0-f173.google.com
[209.85.192.173])
by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 2CD22443
for <bitcoin-dev@lists.linuxfoundation.org>;
Fri, 22 Sep 2017 21:39:51 +0000 (UTC)
Received: by mail-pf0-f173.google.com with SMTP id r71so1135491pfe.12
for <bitcoin-dev@lists.linuxfoundation.org>;
Fri, 22 Sep 2017 14:39:51 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=friedenbach-org.20150623.gappssmtp.com; s=20150623;
h=mime-version:subject:from:in-reply-to:date:cc
:content-transfer-encoding:message-id:references:to;
bh=MGH/KEfo/NyZuIxXGMn5Co300AjgYW567euZkx3T6tY=;
b=VTRy6WfD4FRrJRQGemkF4iwYSaHpqUBrKjv+0DQa4W7KnSv32b2j9ATgjoQzoSckCN
YyKEP51XhSR7S3E/NClsUs2gdsMlcg+SvS0OsRMepIAI8OUjTkpFTjTP08AVoMEY3zCO
8Ppi9RUwqRjNwqWYKO2xm8R4Igp69YMg8aM4Ne8PIx3LGMUFdSsP58m1zVe1Frxmb1+M
grKcOyfRwI6yXH//PWwFcBNboMdKX6J0GtpZ3jo+N2o7R7P3m4TjVnFaeykWZIx/YtCX
BvAOd+YU5nRULgJci+rbrl4B/Zg1uk528XX8XKiUor6ShIMzFwIrSuyGdT4aWblckwtG
DxSg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc
:content-transfer-encoding:message-id:references:to;
bh=MGH/KEfo/NyZuIxXGMn5Co300AjgYW567euZkx3T6tY=;
b=q0ONdCw+s1+uCpmRgZUi1qpPHQMh4GohmwQYK39lpmynRTYP2DIlXmw8OnAz/zU5YH
XzCeyRLMPkmc7h8/ybwMY4gtC0HcgaWFmtsmk88DMRH6nAHX+ORYAfD1yA5D0+a3OD9N
iCS/rPBFY2KVOmHlHGwf84dkeYZPZm7dakt+zwwptwq9k3e7Q107zvCsJmDMbIUGzlMq
MM8XdfNr4k1pgqKLy3vcvpYycS+uaZAlvaCHEEBZrW9lulHcPpvdfaWf6mBY7Cb0xCHr
ul1ZU1ckF3YR6uXiv27yeBxQTiOzBK2zNoDel4upHYpbZVQ3rmamtrnbHMF5L66rBjOv
0g6g==
X-Gm-Message-State: AHPjjUgY4OmOciwZVwaK6mUAUYbSiFuR1qL5WjU4ECSMqXHUozo4NVvN
+XUyI9PSLK0/Y2Xg8CkCxtU3UQ==
X-Google-Smtp-Source: AOwi7QDtI/vr7QH3woQLVWjcc6s79XsQMQtshqaEV5VWrJdHwguHuwOmo/WdAcws4ldd/lyPe3C8iA==
X-Received: by 10.84.132.66 with SMTP id 60mr421610ple.158.1506116390826;
Fri, 22 Sep 2017 14:39:50 -0700 (PDT)
Received: from ?IPv6:2601:640:103:944:cc86:8129:31f4:569e?
([2601:640:103:944:cc86:8129:31f4:569e])
by smtp.gmail.com with ESMTPSA id
l66sm864365pfc.112.2017.09.22.14.39.49
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Fri, 22 Sep 2017 14:39:50 -0700 (PDT)
Content-Type: text/plain; charset=us-ascii
Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\))
From: Mark Friedenbach <mark@friedenbach.org>
In-Reply-To: <CAKzdR-pnvystx5H+P+OCXm73aVmWdyesCymerSgx=pCuXx+YGA@mail.gmail.com>
Date: Fri, 22 Sep 2017 14:39:45 -0700
Content-Transfer-Encoding: quoted-printable
Message-Id: <9FD4AF03-28A5-4B8A-9C12-CBCB1BC2E22C@friedenbach.org>
References: <5B6756D0-6BEF-4A01-BDB8-52C646916E29@friedenbach.org>
<C623794E-F061-4C7A-B05D-378798ED2BF7@friedenbach.org>
<201709190309.08669.luke@dashjr.org>
<CAA2B000-6C54-4AD7-B931-43C99D615A61@friedenbach.org>
<CAKzdR-phAarTY16BOnC95BPN0qMNEE_XZ9H-XmFeeaBc2V1U5w@mail.gmail.com>
<3385CE20-C1BA-40DD-8FC3-8F53F3350717@friedenbach.org>
<CAKzdR-pnvystx5H+P+OCXm73aVmWdyesCymerSgx=pCuXx+YGA@mail.gmail.com>
To: Sergio Demian Lerner <sergio.d.lerner@gmail.com>
X-Mailer: Apple Mail (2.3273)
X-Spam-Status: No, score=0.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID,
RCVD_IN_DNSWL_NONE autolearn=disabled version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
smtp1.linux-foundation.org
X-Mailman-Approved-At: Fri, 22 Sep 2017 21:42:22 +0000
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] cleanstack alt stack & softfork improvements
(Was: Merkle branch verification & tail-call semantics for generalized
MAST)
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: Fri, 22 Sep 2017 21:39:51 -0000
You generally know the witness size to within a few bytes right before =
signing. Why would you not? You know the size of ECDSA signatures. You =
can be told the size of a hash preimage by the other party. It takes =
some contriving to come up with a scheme where one party has =
variable-length signatures of their chosing
> On Sep 22, 2017, at 2:32 PM, Sergio Demian Lerner =
<sergio.d.lerner@gmail.com> wrote:
>=20
> But generally before one signs a transaction one does not know the =
signature size (which may be variable). One can only estimate the =
maximum size.=20
|
