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
|
Return-Path: <luke@dashjr.org>
Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org
[172.17.192.35])
by mail.linuxfoundation.org (Postfix) with ESMTPS id ECFFED1E
for <bitcoin-dev@lists.linuxfoundation.org>;
Fri, 23 Sep 2016 22:21:43 +0000 (UTC)
X-Greylist: from auto-whitelisted by SQLgrey-1.7.6
Received: from zinan.dashjr.org (unknown [192.3.11.21])
by smtp1.linuxfoundation.org (Postfix) with ESMTP id 4AAF81D1
for <bitcoin-dev@lists.linuxfoundation.org>;
Fri, 23 Sep 2016 22:21:43 +0000 (UTC)
Received: from ishibashi.localnet (unknown
[IPv6:2001:470:5:265:61b6:56a6:b03d:28d6])
(Authenticated sender: luke-jr)
by zinan.dashjr.org (Postfix) with ESMTPSA id BD49A38AB854;
Fri, 23 Sep 2016 22:20:42 +0000 (UTC)
X-Hashcash: 1:25:160923:roconnor@blockstream.io::diNqwTzoRK6Q4uzF:bYWwg
X-Hashcash: 1:25:160923:bitcoin-dev@lists.linuxfoundation.org::3baULeyCJAzdlHFu:dhWMr
From: Luke Dashjr <luke@dashjr.org>
To: "Russell O'Connor" <roconnor@blockstream.io>
Date: Fri, 23 Sep 2016 22:20:39 +0000
User-Agent: KMail/1.13.7 (Linux/4.4.21-gentoo; KDE/4.14.24; x86_64; ; )
References: <201609230957.03138.luke@dashjr.org>
<CAMZUoKnY7s1b75Z_0QCb2hh-Q_hCE4-9dZ9tY58HaUQy6=aCbw@mail.gmail.com>
In-Reply-To: <CAMZUoKnY7s1b75Z_0QCb2hh-Q_hCE4-9dZ9tY58HaUQy6=aCbw@mail.gmail.com>
X-PGP-Key-Fingerprint: E463 A93F 5F31 17EE DE6C 7316 BD02 9424 21F4 889F
X-PGP-Key-ID: BD02942421F4889F
X-PGP-Keyserver: hkp://pgp.mit.edu
MIME-Version: 1.0
Content-Type: Text/Plain;
charset="iso-8859-15"
Content-Transfer-Encoding: 7bit
Message-Id: <201609232220.41783.luke@dashjr.org>
X-Spam-Status: No, score=-0.9 required=5.0 tests=BAYES_00,RDNS_DYNAMIC
autolearn=no version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
smtp1.linux-foundation.org
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP draft: OP_CHECKBLOCKATHEIGHT
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, 23 Sep 2016 22:21:44 -0000
In the innocent use case of this opcode, a double-spend has already occurred,
and this should be a strict improvement. In the non-innocent abuse of this
opcode, I don't see that it's any worse than simply double-spending.
Would this proposal be better or otherwise more acceptable, if a specified
height more recent than 100 blocks deep causes the script to fail? This would
increase delays in recovering the double-spend situation of course... but less
than 24h.
Luke
On Friday, September 23, 2016 1:43:15 PM Russell O'Connor wrote:
> I believe Bitcoin currently enjoys the property that during an "innocent"
> re-org, i.e. a reorg in which no affected transactions are being double
> spent, all affected transactions can always eventually get replayed, so
> long as the re-org depth is less than 100.
>
> My concern with this proposed operation is that it would destroy this
> property.
>
> On Fri, Sep 23, 2016 at 5:57 AM, Luke Dashjr via bitcoin-dev <
>
> bitcoin-dev@lists.linuxfoundation.org> wrote:
> > This BIP describes a new opcode (OP_CHECKBLOCKATHEIGHT) for the Bitcoin
> > scripting system to address reissuing bitcoin transactions when the coins
> > they
> > spend have been conflicted/double-spent.
> >
> > https://github.com/luke-jr/bips/blob/bip-cbah/bip-cbah.mediawiki
> >
> > Does this seem like a good idea/approach?
> >
> > Luke
> > _______________________________________________
> > bitcoin-dev mailing list
> > bitcoin-dev@lists.linuxfoundation.org
> > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
|