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
|
Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192]
helo=mx.sourceforge.net)
by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76)
(envelope-from <alex.mizrahi@gmail.com>) id 1WcyiY-0002Dm-8Q
for bitcoin-development@lists.sourceforge.net;
Wed, 23 Apr 2014 15:04:10 +0000
Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of gmail.com
designates 209.85.216.49 as permitted sender)
client-ip=209.85.216.49; envelope-from=alex.mizrahi@gmail.com;
helo=mail-qa0-f49.google.com;
Received: from mail-qa0-f49.google.com ([209.85.216.49])
by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128)
(Exim 4.76) id 1WcyiU-0008Tf-4S
for bitcoin-development@lists.sourceforge.net;
Wed, 23 Apr 2014 15:04:10 +0000
Received: by mail-qa0-f49.google.com with SMTP id j7so952237qaq.36
for <bitcoin-development@lists.sourceforge.net>;
Wed, 23 Apr 2014 08:04:00 -0700 (PDT)
MIME-Version: 1.0
X-Received: by 10.224.73.136 with SMTP id q8mr32998584qaj.54.1398265440636;
Wed, 23 Apr 2014 08:04:00 -0700 (PDT)
Received: by 10.96.77.38 with HTTP; Wed, 23 Apr 2014 08:04:00 -0700 (PDT)
In-Reply-To: <CANEZrP0szimdFSk23aMfO8p2Xtgfbm6kZ=x3rmdPDFUD73xHMg@mail.gmail.com>
References: <CANEZrP0szimdFSk23aMfO8p2Xtgfbm6kZ=x3rmdPDFUD73xHMg@mail.gmail.com>
Date: Wed, 23 Apr 2014 18:04:00 +0300
Message-ID: <CAE28kUQ9WOnHuFR6WYeU6rep3b74zDweTPxffF0L6FjZObXE6A@mail.gmail.com>
From: Alex Mizrahi <alex.mizrahi@gmail.com>
To: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Content-Type: multipart/alternative; boundary=001a11c3dc48e47cab04f7b70a2b
X-Spam-Score: -0.6 (/)
X-Spam-Report: Spam Filtering performed by mx.sourceforge.net.
See http://spamassassin.org/tag/ for more details.
-1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for
sender-domain
0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider
(alex.mizrahi[at]gmail.com)
-0.0 SPF_PASS SPF: sender matches SPF record
1.0 HTML_MESSAGE BODY: HTML included in message
-0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from
author's domain
0.1 DKIM_SIGNED Message has a DKIM or DK signature,
not necessarily valid
-0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
X-Headers-End: 1WcyiU-0008Tf-4S
Subject: Re: [Bitcoin-development] Coinbase reallocation to discourage
Finney attacks
X-BeenThere: bitcoin-development@lists.sourceforge.net
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: <bitcoin-development.lists.sourceforge.net>
List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>,
<mailto:bitcoin-development-request@lists.sourceforge.net?subject=unsubscribe>
List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=bitcoin-development>
List-Post: <mailto:bitcoin-development@lists.sourceforge.net>
List-Help: <mailto:bitcoin-development-request@lists.sourceforge.net?subject=help>
List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>,
<mailto:bitcoin-development-request@lists.sourceforge.net?subject=subscribe>
X-List-Received-Date: Wed, 23 Apr 2014 15:04:10 -0000
--001a11c3dc48e47cab04f7b70a2b
Content-Type: text/plain; charset=UTF-8
This is outright ridiculous.
Zero-confirmation double-spending is a small problem, and possible
solutions are known. (E.g. trusted third party + multi-sig addresses for
small-value transactions.)
On the other hand, protocol changes like described above might have
game-theoretical implications which are non-trivial and hard to understand.
The above approach works as long as the majority of hashpower is honest,
> defined to mean, working to stop double spending. This is the same security
> property as described in the white paper, thus this introduces no new
> security assumptions.
>
No. Bitcoin should work if miners are merely individually rational, i.e.
they try to maximize their pay-offs without colluding with others.
I guess word "honest" might have different meanings, that can be a source
of confusing.
1. Honest -- not trying to destroy bitcoin
2. Honest -- following rules which are not required by the protocol
--001a11c3dc48e47cab04f7b70a2b
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">This is outright ridiculous.<div><br></div><div>Zero-confi=
rmation double-spending is a small problem, and possible solutions are know=
n. (E.g. trusted third party + multi-sig addresses for small-value transact=
ions.)</div>
<div><br></div><div>On the other hand, protocol changes like described abov=
e might have game-theoretical implications which are non-trivial and hard t=
o understand.</div><div><br></div><div class=3D"gmail_extra"><div class=3D"=
gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>The above approach wor=
ks as long as the majority of hashpower is honest, defined to mean, working=
to stop double spending. This is the same security property as described i=
n the white paper, thus this introduces no new security assumptions.</div>
</div></blockquote><div><br></div><div>No. Bitcoin should work if miners ar=
e merely individually rational, i.e. they try to maximize their pay-offs wi=
thout colluding with others.</div><div><br></div><div>I guess word "ho=
nest" might have different meanings, that can be a source of confusing=
.</div>
<div>1. Honest -- not trying to destroy bitcoin</div><div>2. Honest -- foll=
owing rules which are not required by the protocol</div><div><br></div><div=
><br></div></div></div></div>
--001a11c3dc48e47cab04f7b70a2b--
|