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
|
Return-Path: <j@toom.im>
Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org
[172.17.192.35])
by mail.linuxfoundation.org (Postfix) with ESMTPS id D27AB10F5
for <bitcoin-dev@lists.linuxfoundation.org>;
Sat, 26 Dec 2015 21:22:12 +0000 (UTC)
X-Greylist: from auto-whitelisted by SQLgrey-1.7.6
Received: from d.mail.sonic.net (d.mail.sonic.net [64.142.111.50])
by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 65FB7ED
for <bitcoin-dev@lists.linuxfoundation.org>;
Sat, 26 Dec 2015 21:22:12 +0000 (UTC)
Received: from [192.168.1.190] (63.135.62.197.nwinternet.com [63.135.62.197]
(may be forged)) (authenticated bits=0)
by d.mail.sonic.net (8.15.1/8.15.1) with ESMTPSA id tBQLM7W6020422
(version=TLSv1 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT);
Sat, 26 Dec 2015 13:22:08 -0800
Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\))
Content-Type: multipart/signed;
boundary="Apple-Mail=_B7C15672-F739-4C78-A890-78ED9F44E21A";
protocol="application/pgp-signature"; micalg=pgp-sha512
X-Pgp-Agent: GPGMail 2.5.2
From: Jonathan Toomim <j@toom.im>
In-Reply-To: <ema8a70574-c28e-4c43-a1e3-5f2f4df7d3a2@platinum>
Date: Sat, 26 Dec 2015 13:22:36 -0800
Message-Id: <CCA40088-E9CE-4EC0-9C3A-E355A6C3389F@toom.im>
References: <ema8a70574-c28e-4c43-a1e3-5f2f4df7d3a2@platinum>
To: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
X-Mailer: Apple Mail (2.1878.6)
X-Sonic-CAuth: UmFuZG9tSVZzIR7J8wNw60B3JpDhPrLiE3Br2D/+WGX3SJIFA1Hxpul7yZAwFWfBo3Imut35quXLUMe1DHTAtjk1XCOioLUZ
X-Sonic-ID: C;7j3gtxas5RGArMgxU3XIUw== M;hgBTuBas5RGArMgxU3XIUw==
X-Sonic-Spam-Details: 3.8/5.0 by cerberusd
X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_05,RCVD_IN_DNSWL_LOW
autolearn=ham version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
smtp1.linux-foundation.org
Subject: Re: [bitcoin-dev] We need to fix the block withholding attack
X-BeenThere: bitcoin-dev@lists.linuxfoundation.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Bitcoin Development 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: Sat, 26 Dec 2015 21:22:12 -0000
--Apple-Mail=_B7C15672-F739-4C78-A890-78ED9F44E21A
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
charset=us-ascii
Another option for how to deal with block withholding attacks: Give the =
miner who finds the block a bonus. This could even be part of the =
coinbase transaction.
Block withholding is effective because it costs the attacker 0% and =
costs the pool 100%. If the pool's coinbase tx was 95% to the pool, 5% =
(1.25 BTC) to the miner, that would make block withholding attacks much =
more expensive to the attacker without making a huge impact on reward =
variance for small miners. If your pool gets attacked by a block =
withholding attack, then you can respond by jacking up the bonus ratio. =
At some point, block withholding attacks become unfeasibly expensive to =
perform. This can work because the pool sacrifices a small amount of =
variance for its customers by increasing the bonus, but the block =
attacker sacrifices revenue. This should make the attacker give up =
before the pool does.
This system already exists in p2pool, although there the reward bonus =
for the block's finder is only 0.5%.
This must have been proposed before, right? Anyone know of a good =
analysis of the game theory math?
--Apple-Mail=_B7C15672-F739-4C78-A890-78ED9F44E21A
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename=signature.asc
Content-Type: application/pgp-signature;
name=signature.asc
Content-Description: Message signed with OpenPGP using GPGMail
-----BEGIN PGP SIGNATURE-----
Comment: GPGTools - https://gpgtools.org
iQEcBAEBCgAGBQJWfwUdAAoJEIEuMk4MG0P1XFUH/1glJZESMdK0tSxDxJCrpyZl
eRXXP794Rp09nBb7v5lopgiCfBVQos/jixnmAGmqteHr4ArxUQG49cip3lSE8yuQ
n7V4K3sY4JGNYU1hFeDPXvbgtxBSIV9v+LH4HxjNua4p06n1Bdf83BfNx7bFAz9x
j1pkKl5nwW98fK2qQuIj+xL35h9+n1HpLfg2LC8NDkV8L4GsP7k1a0+n89t/3YKR
JCQ/7UHDA7n+0K24TETSY9busP3hOdHTTe33RReryx90UZzRQXe3BJnJWKBUQ6Ch
qVFcKN3HJj3nX68YLcRnTt4D/V4ZG7eVP4RAZSQvLSAFoheiAXtdGAbBrtwonas=
=Dvf/
-----END PGP SIGNATURE-----
--Apple-Mail=_B7C15672-F739-4C78-A890-78ED9F44E21A--
|
