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Date: Tue, 18 Mar 2025 08:32:40 -0700 (PDT)
From: weichu deng <weichudeng@stu2024.jnu.edu.cn>
To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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 <Z9hTu2TjMlLr5-Eg@petertodd.org>
Subject: =?UTF-8?Q?Re=3A_=5Bbitcoindev=5D_New_Proposal=EF=BC=9AString_Substring_Sea?=
	=?UTF-8?Q?rch_in_Bitcoin_Script_=2D_OP=5FISSUBSTR?=
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Hi, Peter Todd
Thanks for your feedback. I agree that "Bitcoin scripts are about=20
validation. Not computation."
String search and concatenation are equivalent in some cases, such as in=20
the example you provided.
However, it is still necessary to introduce the OP_ISSUBSTR operation=20
separately.
One example is converting a non-deterministic signature to a deterministic=
=20
one.
Another case is when the substring in question is located in the middle of=
=20
the checked string.
CAT cannot replace ISSUBSTR for the following reasons:

   1. The security of CAT is still controversial. It can easily generate=20
   overly long strings, potentially causing a stack overflow. Additionally,=
=20
   whether OP_CAT will be restored is still under discussion.
   2. The other substring (bar) must be known in advance.
  =20

With respect,

Weichu Deng

weichudeng@stu2024.jnu.edu.cn
=E5=9C=A82025=E5=B9=B43=E6=9C=8818=E6=97=A5=E6=98=9F=E6=9C=9F=E4=BA=8C UTC+=
8 01:01:16<Peter Todd> =E5=86=99=E9=81=93=EF=BC=9A

On Mon, Mar 17, 2025 at 09:14:05AM -0700, weichu deng wrote:=20
>=20
>=20
> Dear fellow Bitcoin developers,=20
>=20
>=20
>=20
> I am pleased to present a new BIP proposal. This proposal introduces a=20
new=20
> opcode for Bitcoin scripts: OP_ISSUBSTR.=20
>=20
>=20
> *Abstract*=20
>=20
> This BIP introduces two string opcodes, OP_ISSUBSTR and OP_ISSUBSTRVERIFY=
=20
> (similar to the relationship between OP_EQUAL and OP_EQUALVERIFY), to=20
> determine whether one string is a substring of another. As these opcodes=
=20
do=20
> not alter any blockchain state, they are secure.=20

Bitcoin scripts are about validation. Not computation.=20

This means that substring search and concatenation are equivalent. For=20
every script that validates a substring search, you can instead=20
concatenate the substring with the rest of the string, and validate=20
equality instead.=20

Basically speaking:=20

foobar foo IsSubStr=20

is equivalent to:=20

foobar foo bar Cat Equal=20

A real-world example would be more complex. But I hope that illustrates=20
my point sufficiently.=20

--=20
https://petertodd.org 'peter'[:-1]@petertodd.org=20

--=20
You received this message because you are subscribed to the Google Groups "=
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To unsubscribe from this group and stop receiving emails from it, send an e=
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To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/=
678d40e3-3e22-4d55-82c0-b25ccafb87ecn%40googlegroups.com.

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<div style=3D"padding: 0px; border: 0px; font-variant-numeric: inherit; fon=
t-variant-east-asian: inherit; font-variant-alternates: inherit; font-varia=
nt-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; l=
ine-height: 24px; font-family: -apple-system, BlinkMacSystemFont, &quot;Hel=
vetica Neue&quot;, Helvetica, &quot;Segoe UI&quot;, Arial, Roboto, &quot;Pi=
ngFang SC&quot;, MIUI, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&=
quot;, sans-serif; font-optical-sizing: inherit; font-size-adjust: inherit;=
 font-kerning: inherit; font-feature-settings: inherit; font-variation-sett=
ings: inherit; vertical-align: baseline; margin-inline: 0px; margin: 0px 0p=
x 0.859em; letter-spacing: 0.25px; max-width: 100%; overflow: auto hidden; =
white-space-collapse: preserve; color: rgb(6, 6, 7); word-break: break-word=
;">Hi, <span style=3D"color: rgb(32, 33, 36); font-family: Roboto, Arial, s=
ans-serif; text-wrap-mode: nowrap;">Peter Todd</span></div><div style=3D"pa=
dding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-a=
sian: inherit; font-variant-alternates: inherit; font-variant-position: inh=
erit; font-variant-emoji: inherit; font-stretch: inherit; line-height: 24px=
; font-family: -apple-system, BlinkMacSystemFont, &quot;Helvetica Neue&quot=
;, Helvetica, &quot;Segoe UI&quot;, Arial, Roboto, &quot;PingFang SC&quot;,=
 MIUI, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, sans-seri=
f; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: i=
nherit; font-feature-settings: inherit; font-variation-settings: inherit; v=
ertical-align: baseline; margin-inline: 0px; margin: 0px 0px 0.859em; lette=
r-spacing: 0.25px; max-width: 100%; overflow: auto hidden; white-space-coll=
apse: preserve; color: rgb(6, 6, 7); word-break: break-word;">Thanks for yo=
ur feedback. I agree that "Bitcoin scripts are about validation. Not comput=
ation."</div><div style=3D"padding: 0px; border: 0px; font-variant-numeric:=
 inherit; font-variant-east-asian: inherit; font-variant-alternates: inheri=
t; font-variant-position: inherit; font-variant-emoji: inherit; font-stretc=
h: inherit; line-height: 24px; font-family: -apple-system, BlinkMacSystemFo=
nt, &quot;Helvetica Neue&quot;, Helvetica, &quot;Segoe UI&quot;, Arial, Rob=
oto, &quot;PingFang SC&quot;, MIUI, &quot;Hiragino Sans GB&quot;, &quot;Mic=
rosoft YaHei&quot;, sans-serif; font-optical-sizing: inherit; font-size-adj=
ust: inherit; font-kerning: inherit; font-feature-settings: inherit; font-v=
ariation-settings: inherit; vertical-align: baseline; margin-inline: 0px; m=
argin: 0px 0px 0.859em; letter-spacing: 0.25px; max-width: 100%; overflow: =
auto hidden; white-space-collapse: preserve; color: rgb(6, 6, 7); word-brea=
k: break-word;">String search and concatenation are equivalent in some case=
s, such as in the example you provided.</div><div style=3D"padding: 0px; bo=
rder: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit;=
 font-variant-alternates: inherit; font-variant-position: inherit; font-var=
iant-emoji: inherit; font-stretch: inherit; line-height: 24px; font-family:=
 -apple-system, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, Helvetica, =
&quot;Segoe UI&quot;, Arial, Roboto, &quot;PingFang SC&quot;, MIUI, &quot;H=
iragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, sans-serif; font-optica=
l-sizing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-f=
eature-settings: inherit; font-variation-settings: inherit; vertical-align:=
 baseline; margin-inline: 0px; margin: 0px 0px 0.859em; letter-spacing: 0.2=
5px; max-width: 100%; overflow: auto hidden; white-space-collapse: preserve=
; color: rgb(6, 6, 7); word-break: break-word;">However, it is still necess=
ary to introduce the OP_ISSUBSTR operation separately.</div><div style=3D"p=
adding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-=
asian: inherit; font-variant-alternates: inherit; font-variant-position: in=
herit; font-variant-emoji: inherit; font-stretch: inherit; line-height: 24p=
x; font-family: -apple-system, BlinkMacSystemFont, &quot;Helvetica Neue&quo=
t;, Helvetica, &quot;Segoe UI&quot;, Arial, Roboto, &quot;PingFang SC&quot;=
, MIUI, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, sans-ser=
if; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: =
inherit; font-feature-settings: inherit; font-variation-settings: inherit; =
vertical-align: baseline; margin-inline: 0px; margin: 0px 0px 0.859em; lett=
er-spacing: 0.25px; max-width: 100%; overflow: auto hidden; white-space-col=
lapse: preserve; color: rgb(6, 6, 7); word-break: break-word;">One example =
is converting a non-deterministic signature to a deterministic one.</div><d=
iv style=3D"padding: 0px; border: 0px; font-variant-numeric: inherit; font-=
variant-east-asian: inherit; font-variant-alternates: inherit; font-variant=
-position: inherit; font-variant-emoji: inherit; font-stretch: inherit; lin=
e-height: 24px; font-family: -apple-system, BlinkMacSystemFont, &quot;Helve=
tica Neue&quot;, Helvetica, &quot;Segoe UI&quot;, Arial, Roboto, &quot;Ping=
Fang SC&quot;, MIUI, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&qu=
ot;, sans-serif; font-optical-sizing: inherit; font-size-adjust: inherit; f=
ont-kerning: inherit; font-feature-settings: inherit; font-variation-settin=
gs: inherit; vertical-align: baseline; margin-inline: 0px; margin: 0px 0px =
0.859em; letter-spacing: 0.25px; max-width: 100%; overflow: auto hidden; wh=
ite-space-collapse: preserve; color: rgb(6, 6, 7); word-break: break-word;"=
>Another case is when the substring in question is located in the middle of=
 the checked string.</div><div style=3D"padding: 0px; border: 0px; font-var=
iant-numeric: inherit; font-variant-east-asian: inherit; font-variant-alter=
nates: inherit; font-variant-position: inherit; font-variant-emoji: inherit=
; font-stretch: inherit; line-height: 24px; font-family: -apple-system, Bli=
nkMacSystemFont, &quot;Helvetica Neue&quot;, Helvetica, &quot;Segoe UI&quot=
;, Arial, Roboto, &quot;PingFang SC&quot;, MIUI, &quot;Hiragino Sans GB&quo=
t;, &quot;Microsoft YaHei&quot;, sans-serif; font-optical-sizing: inherit; =
font-size-adjust: inherit; font-kerning: inherit; font-feature-settings: in=
herit; font-variation-settings: inherit; vertical-align: baseline; margin-i=
nline: 0px; margin: 0px 0px 0.859em; letter-spacing: 0.25px; max-width: 100=
%; overflow: auto hidden; white-space-collapse: preserve; color: rgb(6, 6, =
7); word-break: break-word;">CAT cannot replace ISSUBSTR for the following =
reasons:</div><ol start=3D"1" style=3D"padding: 0px 0px 0px 2em; border: 0p=
x; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-va=
riant-alternates: inherit; font-variant-position: inherit; font-variant-emo=
ji: inherit; font-stretch: inherit; line-height: inherit; font-family: -app=
le-system, BlinkMacSystemFont, &quot;Helvetica Neue&quot;, Helvetica, &quot=
;Segoe UI&quot;, Arial, Roboto, &quot;PingFang SC&quot;, MIUI, &quot;Hiragi=
no Sans GB&quot;, &quot;Microsoft YaHei&quot;, sans-serif; font-optical-siz=
ing: inherit; font-size-adjust: inherit; font-kerning: inherit; font-featur=
e-settings: inherit; font-variation-settings: inherit; vertical-align: base=
line; list-style-position: initial; list-style-image: initial; margin-inlin=
e: 0px; margin: 0.859em 0px 0px; color: rgb(6, 6, 7); letter-spacing: 0.5px=
;"><li style=3D"margin: 0px; padding: 0px; border: 0px; font-style: inherit=
; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-=
size: inherit; line-height: 24px; font-family: inherit; font-optical-sizing=
: inherit; font-size-adjust: inherit; font-kerning: inherit; font-feature-s=
ettings: inherit; font-variation-settings: inherit; vertical-align: baselin=
e; letter-spacing: 0.25px;"><div style=3D"padding: 0px; border: 0px; font-s=
tyle: inherit; font-variant: inherit; font-weight: inherit; font-stretch: i=
nherit; line-height: 24px; font-family: inherit; font-optical-sizing: inher=
it; font-size-adjust: inherit; font-kerning: inherit; font-feature-settings=
: inherit; font-variation-settings: inherit; vertical-align: baseline; marg=
in-inline: 0px; margin: 0px; max-width: 100%; overflow: visible; white-spac=
e-collapse: preserve; word-break: break-word;">The security of CAT is still=
 controversial. It can easily generate overly long strings, potentially cau=
sing a stack overflow. Additionally, whether OP_CAT will be restored is sti=
ll under discussion.</div></li><li style=3D"margin: 0px; padding: 0px; bord=
er: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; =
font-stretch: inherit; font-size: inherit; line-height: 24px; font-family: =
inherit; font-optical-sizing: inherit; font-size-adjust: inherit; font-kern=
ing: inherit; font-feature-settings: inherit; font-variation-settings: inhe=
rit; vertical-align: baseline; letter-spacing: 0.25px;"><div style=3D"paddi=
ng: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weig=
ht: inherit; font-stretch: inherit; line-height: 24px; font-family: inherit=
; font-optical-sizing: inherit; font-size-adjust: inherit; font-kerning: in=
herit; font-feature-settings: inherit; font-variation-settings: inherit; ve=
rtical-align: baseline; margin-inline: 0px; margin: 0px; max-width: 100%; o=
verflow: visible; white-space-collapse: preserve; word-break: break-word;">=
The other substring (bar) must be known in advance.</div></li></ol><div><fo=
nt color=3D"#060607" face=3D"-apple-system, BlinkMacSystemFont, Helvetica N=
eue, Helvetica, Segoe UI, Arial, Roboto, PingFang SC, MIUI, Hiragino Sans G=
B, Microsoft YaHei, sans-serif"><span style=3D"letter-spacing: 0.25px; whit=
e-space-collapse: preserve;"><br /></span></font></div><div><p><span lang=
=3D"EN-US">With respect,</span></p>

<p><span lang=3D"EN-US">Weichu Deng</span></p>

<p><span lang=3D"EN-US"><a href=3D"mailto:weichudeng@stu2024.jnu.edu.cn" ta=
rget=3D"_blank">weichudeng@stu2024.jnu.edu.cn</a></span></p></div><div><div=
 dir=3D"auto">=E5=9C=A82025=E5=B9=B43=E6=9C=8818=E6=97=A5=E6=98=9F=E6=9C=9F=
=E4=BA=8C UTC+8 01:01:16&lt;Peter Todd&gt; =E5=86=99=E9=81=93=EF=BC=9A<br /=
></div><blockquote style=3D"margin: 0px 0px 0px 0.8ex; border-left: 1px sol=
id rgb(204, 204, 204); padding-left: 1ex;">On Mon, Mar 17, 2025 at 09:14:05=
AM -0700, weichu deng wrote:
<br />&gt;=20
<br />&gt;=20
<br />&gt; Dear fellow Bitcoin developers,
<br />&gt;=20
<br />&gt; =20
<br />&gt;=20
<br />&gt; I am pleased to present a new BIP proposal. This proposal introd=
uces a new=20
<br />&gt; opcode for Bitcoin scripts: OP_ISSUBSTR.
<br />&gt;=20
<br />&gt;=20
<br />&gt; *Abstract*
<br />&gt;=20
<br />&gt; This BIP introduces two string opcodes, OP_ISSUBSTR and OP_ISSUB=
STRVERIFY=20
<br />&gt; (similar to the relationship between OP_EQUAL and OP_EQUALVERIFY=
), to=20
<br />&gt; determine whether one string is a substring of another. As these=
 opcodes do=20
<br />&gt; not alter any blockchain state, they are secure.
<br />
<br />Bitcoin scripts are about validation. Not computation.
<br />
<br />This means that substring search and concatenation are equivalent. Fo=
r
<br />every script that validates a substring search, you can instead
<br />concatenate the substring with the rest of the string, and validate
<br />equality instead.
<br />
<br />Basically speaking:
<br />
<br />	foobar foo IsSubStr
<br />
<br />is equivalent to:
<br />
<br />	foobar foo bar Cat Equal
<br />
<br />A real-world example would be more complex. But I hope that illustrat=
es
<br />my point sufficiently.
<br />
<br />--=20
<br /><a href=3D"https://petertodd.org" target=3D"_blank" rel=3D"nofollow">=
https://petertodd.org</a> 'peter'[:-1]@<a href=3D"http://petertodd.org" tar=
get=3D"_blank" rel=3D"nofollow">petertodd.org</a>
<br /></blockquote></div>

<p></p>

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