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
|
Return-Path: <ZmnSCPxj@protonmail.com>
Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136])
by lists.linuxfoundation.org (Postfix) with ESMTP id 0EE6BC000D
for <bitcoin-dev@lists.linuxfoundation.org>;
Thu, 7 Oct 2021 10:02:03 +0000 (UTC)
Received: from localhost (localhost [127.0.0.1])
by smtp3.osuosl.org (Postfix) with ESMTP id D164F60754
for <bitcoin-dev@lists.linuxfoundation.org>;
Thu, 7 Oct 2021 10:02:02 +0000 (UTC)
X-Virus-Scanned: amavisd-new at osuosl.org
X-Spam-Flag: NO
X-Spam-Score: -0.199
X-Spam-Level:
X-Spam-Status: No, score=-0.199 tagged_above=-999 required=5
tests=[BAYES_05=-0.5, DKIM_SIGNED=0.1, DKIM_VALID=-0.1,
DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,
FROM_LOCAL_NOVOWEL=0.5, RCVD_IN_MSPIKE_H4=0.001,
RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001]
autolearn=ham autolearn_force=no
Authentication-Results: smtp3.osuosl.org (amavisd-new);
dkim=pass (1024-bit key) header.d=protonmail.com
Received: from smtp3.osuosl.org ([127.0.0.1])
by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id iwmeLtl3Ygd1
for <bitcoin-dev@lists.linuxfoundation.org>;
Thu, 7 Oct 2021 10:02:01 +0000 (UTC)
X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0
Received: from mail-40140.protonmail.ch (mail-40140.protonmail.ch
[185.70.40.140])
by smtp3.osuosl.org (Postfix) with ESMTPS id 89C276071A
for <bitcoin-dev@lists.linuxfoundation.org>;
Thu, 7 Oct 2021 10:02:01 +0000 (UTC)
Date: Thu, 07 Oct 2021 10:01:53 +0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com;
s=protonmail; t=1633600919;
bh=6pZf+PlNzcSQUB8OXYFTfQ+fo1y1d6EFUczDo9bkHcU=;
h=Date:To:From:Cc:Reply-To:Subject:In-Reply-To:References:From;
b=Ib8Xe+x+IB7irI9DnRezIALhyTlBA9RToEn5p1prT2FavY6W5n0uG4OLKvzW3PNn7
+XVkAi16vdsdnuEokN83SVYnPp1z/WxaSj+uCSBL5yF2DVvuxpjpKiNiRkyjecirxx
3z6dpEgp8q+3wAAFx+HFaHJ9kfnAHNf67qhWRdA4=
To: shymaa arafat <shymaa.arafat@gmail.com>
From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
Reply-To: ZmnSCPxj <ZmnSCPxj@protonmail.com>
Message-ID: <ZKZ4RR6uAv0mG8yFQyRkWDTFQ7JnsGVfLQcMTmsc5ui7MTJXuzMkVk5YQTniPuc4F_KRhn7BEZZHEK60IZYZYU9A1r-tbmfPTnIs0pOd7oU=@protonmail.com>
In-Reply-To: <CAM98U8nSOQ9HpdRLBdkcFAdToW=z7_EhnYisMb7F46ExmJkT-w@mail.gmail.com>
References: <CAD5xwhjFBjvkMKev_6HFRuRGcZUi7WjO5d963GNXWN4n-06Pqg@mail.gmail.com>
<20210808215101.wuaidu5ww63ajx6h@ganymede>
<MkPutJpff5rqUxXFQrEyHZl6Iz0DfrJU_-BQD-y0El65GQFnj7igVfmWU79fPCtiFztUYl4ofzrqeaN0HFMB45YPErY9rYY7_h1XkuTMfvc=@wuille.net>
<CAJowKgKt=yYdNOYYNsWh7FJ2EH7rz0bd2EjUjmyA=cA6k5cvUQ@mail.gmail.com>
<BtaljKLqpe75GB6pHEPQMF6_L-hBaE0ZCBGaXrUfnHRYeEbCqFWZ12DaMRm5jEADceL3uPfCiL-WU9MOZJ_m54Zi3Pzu0vSFN3nQvuSKvBM=@protonmail.com>
<CAM98U8nSOQ9HpdRLBdkcFAdToW=z7_EhnYisMb7F46ExmJkT-w@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] [Lightning-dev] Removing the Dust Limit
X-BeenThere: bitcoin-dev@lists.linuxfoundation.org
X-Mailman-Version: 2.1.15
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: Thu, 07 Oct 2021 10:02:03 -0000
Good morning shymaa
> If u allow me to discuss,,,
> I previously suggested storing dust UTXOS in a separate Merkle tree or st=
rucutre in general if we are talking about the original set.
> I'm a kind of person who doesn't like to throw any thing; if it's not nee=
ded now keep it in the basement for example.=C2=A0
> So, if dust UTXOS making a burden keep them in secondary storage, where i=
n such cases u can verify then delete them.
While this technique helps reduce *average* CPU cost, it does not reduce *w=
orst-case* CPU cost (and if the secondary storage trades off to gain increa=
sed capacity per satoshi by sacrificing speed, it can worse the worst-case =
time).
It is helpful to remember that attacks will always target worst-case behavi=
or.
This is why quicksort is strongly disrecommended for processing data coming=
from external sources, its worst-case time is O(n^2).
And we should switch to algorithms like mergesort or similar whose average =
times are generally worse than quicksort but have the major advantage of ke=
eping an O(n log n) worst-case.
Moving data we think is unlikely to be referenced to secondary storage (pre=
sumably in a construction that is slower but gets more storage per economic=
unit) moves us closer to quicksort than mergesort, and we should avoid qui=
cksort-like solutions as it is always the worst-case behavior that is targe=
ted in attacks.
Regards,
ZmnSCPxj
|
