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Date: Sun, 20 Jul 2025 15:19:25 +0000
To: Ethan Heilman <eth3rs@gmail.com>
From: "'conduition' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Subject: Re: [bitcoindev] Human meaningful witness versioning
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Hi Ethan,

I appreciate your intent behind making things easier for humans to understa=
nd, but I don't think it matters enough to break from the existing pattern =
of version incrementation. It's also a bit too late, given that quantum-vul=
nerable address types P2WKH and P2WSH already took the `bc1q` prefix.

More important will be other small minutiae like naming the output type (P2=
QRH? or P2TSH? or P2TTH? etc), and practical necessities like fully-defined=
 post-quantum signature verification opcodes.

regards,
conduition
On Friday, July 18th, 2025 at 6:00 PM, Ethan Heilman <eth3rs@gmail.com> wro=
te:

> I want to propose a new criteria for allocating Witness versions based on=
 human meaningfulness and see if there is support for this approach or if t=
he community is highly allergic to this idea.
>=20

>=20

> Bech32 (BIP-0173) was designed such that the Witness version is the first=
 character in an address after the =E2=80=9Cbc1=E2=80=9D address prefix
>=20

>=20

> Witness Version 0: bc1q=E2=80=A6
> Witness Version 1: bc1p=E2=80=A6
>=20

> Witness version 2: bc1z=E2=80=A6
>=20

> Witness version 3: bc1r=E2=80=A6
>=20

> Witness version 4: bc1y=E2=80=A6
> Witness version 5: bc19=E2=80=A6
>=20

> Witness version 6: bc1x=E2=80=A6
>=20

> Witness version 7: bc18=E2=80=A6
>=20

> Witness version 8: bc1g=E2=80=A6
>=20

> =E2=80=A6
>=20

>=20

>=20

> So far we have been allocating Witness Versions in incrementing numeric o=
rder (0,1,...). I want to suggest we allocate Witness Versions mnemonic to =
make it easier to look at an address and determine the output type.
>=20

>=20

>=20

> This originally came up over the question of if BIP-360 should use Witnes=
s Version 3 to get bc1r=E2=80=A6 for P2QRH (r for resistant) or the next nu=
merically available 2, but I want to see how the community feels about it a=
s a general pattern for future softforks (z for compressed/zipped output, y=
 for yield outputs, etc=E2=80=A6).
>=20

>=20

>=20

> Making it easier for users to understand the output type associated is li=
kely to grow in importance over time as we retire output types, add policy =
restricting the relay of certain output types or output types become insecu=
re due to cryptanalytic breaks. While wallet software should flag dangerous=
 output types, some wallets may not invest in such functionality or the use=
r may be using a paper wallet. This is the same argument as prefixing addre=
sses with =E2=80=9Cbc=E2=80=9D for mainnet and =E2=80=9Ctc=E2=80=9D for tes=
tnet.
>=20

>=20

> Note: the Witness version is sometimes called the SegWit version.
>=20

> Thanks,
> Ethan
>=20

> --
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 "Bitcoin Development Mailing List" group.
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<div style=3D"font-family: Arial, sans-serif; font-size: 14px;">Hi Ethan,</=
div><div style=3D"font-family: Arial, sans-serif; font-size: 14px;"><br></d=
iv><div style=3D"font-family: Arial, sans-serif; font-size: 14px;">I apprec=
iate your intent behind making things easier for humans to understand, but =
I don't think it matters enough to break from the existing pattern of versi=
on incrementation. It's also a bit too late, given that quantum-vulnerable =
address types P2WKH and P2WSH already took the <code>bc1q</code>=E2=80=8B p=
refix.</div><div style=3D"font-family: Arial, sans-serif; font-size: 14px;"=
><br></div><div style=3D"font-family: Arial, sans-serif; font-size: 14px;">=
More important will be other small minutiae like naming the output type (P2=
QRH? or P2TSH? or P2TTH? etc), and practical necessities like fully-defined=
 post-quantum signature verification opcodes.</div><div style=3D"font-famil=
y: Arial, sans-serif; font-size: 14px;"><br></div><div style=3D"font-family=
: Arial, sans-serif; font-size: 14px;">regards,</div><div style=3D"font-fam=
ily: Arial, sans-serif; font-size: 14px;">conduition</div><div class=3D"pro=
tonmail_quote">
        On Friday, July 18th, 2025 at 6:00 PM, Ethan Heilman &lt;eth3rs@gma=
il.com&gt; wrote:<br>
        <blockquote class=3D"protonmail_quote" type=3D"cite">
            <div dir=3D"ltr"><span id=3D"gmail-docs-internal-guid-e6fd3131-=
7fff-2cae-188f-81e79dfa4fb9"><p dir=3D"ltr" style=3D"line-height:1.38;margi=
n-top:0pt;margin-bottom:0pt"><span style=3D"font-size:11pt;font-family:Aria=
l,sans-serif;color:rgb(0,0,0);background-color:transparent;font-variant-num=
eric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;v=
ertical-align:baseline">I want to propose a new criteria for allocating Wit=
ness versions based on human meaningfulness and see if there is support for=
 this approach or if the community is highly allergic to this idea.</span><=
span style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);=
background-color:transparent;font-variant-numeric:normal;font-variant-east-=
asian:normal;font-variant-alternates:normal;vertical-align:baseline"><br><b=
r></span></p><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin=
-bottom:0pt"><span style=3D"font-size:11pt;font-family:Arial,sans-serif;col=
or:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font=
-variant-east-asian:normal;font-variant-alternates:normal;vertical-align:ba=
seline">Bech32 (</span><a href=3D"https://github.com/bitcoin/bips/blob/mast=
er/bip-0173.mediawiki" style=3D"text-decoration-line:none" target=3D"_blank=
" rel=3D"noreferrer nofollow noopener"><span style=3D"font-size:11pt;font-f=
amily:Arial,sans-serif;background-color:transparent;font-variant-numeric:no=
rmal;font-variant-east-asian:normal;font-variant-alternates:normal;text-dec=
oration-line:underline;vertical-align:baseline">BIP-0173</span></a><span st=
yle=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);backgro=
und-color:transparent;font-variant-numeric:normal;font-variant-east-asian:n=
ormal;font-variant-alternates:normal;vertical-align:baseline">) was designe=
d such that the Witness version is the first character in an address after =
the =E2=80=9Cbc1=E2=80=9D address prefix</span><span style=3D"font-size:11p=
t;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:transparen=
t;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-a=
lternates:normal;vertical-align:baseline"><br><br></span></p><p dir=3D"ltr"=
 style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style=3D=
"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-co=
lor:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;=
font-variant-alternates:normal;vertical-align:baseline">Witness Version 0: =
bc1q=E2=80=A6</span><span style=3D"font-size:11pt;font-family:Arial,sans-se=
rif;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:norm=
al;font-variant-east-asian:normal;font-variant-alternates:normal;vertical-a=
lign:baseline"><br></span><span style=3D"font-size:11pt;font-family:Arial,s=
ans-serif;color:rgb(0,0,0);background-color:transparent;font-variant-numeri=
c:normal;font-variant-east-asian:normal;font-variant-alternates:normal;vert=
ical-align:baseline">Witness Version 1: bc1p=E2=80=A6</span></p><p dir=3D"l=
tr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style=
=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background=
-color:transparent;font-variant-numeric:normal;font-variant-east-asian:norm=
al;font-variant-alternates:normal;vertical-align:baseline">Witness version =
2: bc1z=E2=80=A6</span></p><p dir=3D"ltr" style=3D"line-height:1.38;margin-=
top:0pt;margin-bottom:0pt"><span style=3D"font-size:11pt;font-family:Arial,=
sans-serif;color:rgb(0,0,0);background-color:transparent;font-variant-numer=
ic:normal;font-variant-east-asian:normal;font-variant-alternates:normal;ver=
tical-align:baseline">Witness version 3: bc1r=E2=80=A6</span></p><p dir=3D"=
ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span styl=
e=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);backgroun=
d-color:transparent;font-variant-numeric:normal;font-variant-east-asian:nor=
mal;font-variant-alternates:normal;vertical-align:baseline">Witness version=
 4: bc1y=E2=80=A6</span><span style=3D"font-size:11pt;font-family:Arial,san=
s-serif;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:=
normal;font-variant-east-asian:normal;font-variant-alternates:normal;vertic=
al-align:baseline"><br></span><span style=3D"font-size:11pt;font-family:Ari=
al,sans-serif;color:rgb(0,0,0);background-color:transparent;font-variant-nu=
meric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;=
vertical-align:baseline">Witness version 5: bc19=E2=80=A6</span></p><p dir=
=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span =
style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);backg=
round-color:transparent;font-variant-numeric:normal;font-variant-east-asian=
:normal;font-variant-alternates:normal;vertical-align:baseline">Witness ver=
sion 6: bc1x=E2=80=A6</span></p><p dir=3D"ltr" style=3D"line-height:1.38;ma=
rgin-top:0pt;margin-bottom:0pt"><span style=3D"font-size:11pt;font-family:A=
rial,sans-serif;color:rgb(0,0,0);background-color:transparent;font-variant-=
numeric:normal;font-variant-east-asian:normal;font-variant-alternates:norma=
l;vertical-align:baseline">Witness version 7: bc18=E2=80=A6</span></p><p di=
r=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span=
 style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);back=
ground-color:transparent;font-variant-numeric:normal;font-variant-east-asia=
n:normal;font-variant-alternates:normal;vertical-align:baseline">Witness ve=
rsion 8: bc1g=E2=80=A6</span></p><p dir=3D"ltr" style=3D"line-height:1.38;m=
argin-top:0pt;margin-bottom:0pt"><span style=3D"font-size:11pt;font-family:=
Arial,sans-serif;color:rgb(0,0,0);background-color:transparent;font-variant=
-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:norm=
al;vertical-align:baseline">=E2=80=A6</span></p><br><p dir=3D"ltr" style=3D=
"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style=3D"font-siz=
e:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:trans=
parent;font-variant-numeric:normal;font-variant-east-asian:normal;font-vari=
ant-alternates:normal;vertical-align:baseline">So far we have been allocati=
ng Witness Versions in incrementing numeric order (0,1,...). I want to sugg=
est we allocate Witness Versions mnemonic to make it easier to look at an a=
ddress and determine the output type.</span></p><br><p dir=3D"ltr" style=3D=
"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style=3D"font-siz=
e:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:trans=
parent;font-variant-numeric:normal;font-variant-east-asian:normal;font-vari=
ant-alternates:normal;vertical-align:baseline">This originally came up over=
 the question of if BIP-360 should use Witness Version 3 to get bc1r=E2=80=
=A6 for P2QRH (r for resistant) or the next numerically available 2, but I =
want to see how the community feels about it as a general pattern for futur=
e softforks (z for compressed/zipped output, y for yield outputs, etc=E2=80=
=A6).</span></p><br><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt=
;margin-bottom:0pt"><span style=3D"font-size:11pt;font-family:Arial,sans-se=
rif;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:norm=
al;font-variant-east-asian:normal;font-variant-alternates:normal;vertical-a=
lign:baseline">Making it easier for users to understand the output type ass=
ociated is likely to grow in importance over time as we retire output types=
, add policy restricting the relay of certain output types or output types =
become insecure due to cryptanalytic breaks. While wallet software should f=
lag dangerous output types, some wallets may not invest in such functionali=
ty or the user may be using a paper wallet. This is the same argument as pr=
efixing addresses with =E2=80=9Cbc=E2=80=9D for mainnet and =E2=80=9Ctc=E2=
=80=9D for testnet.</span></p><br><span style=3D"font-size:11pt;font-family=
:Arial,sans-serif;color:rgb(0,0,0);background-color:transparent;font-varian=
t-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:nor=
mal;vertical-align:baseline">Note: the Witness version is sometimes called =
the SegWit version.</span><span style=3D"font-size:11pt;font-family:Arial,s=
ans-serif;color:rgb(0,0,0);background-color:transparent;font-variant-numeri=
c:normal;font-variant-east-asian:normal;font-variant-alternates:normal;vert=
ical-align:baseline"><br></span><span style=3D"font-size:11pt;font-family:A=
rial,sans-serif;color:rgb(0,0,0);background-color:transparent;font-variant-=
numeric:normal;font-variant-east-asian:normal;font-variant-alternates:norma=
l;vertical-align:baseline"><br></span><span style=3D"font-size:11pt;font-fa=
mily:Arial,sans-serif;color:rgb(0,0,0);background-color:transparent;font-va=
riant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates=
:normal;vertical-align:baseline">Thanks,</span><span style=3D"font-size:11p=
t;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:transparen=
t;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-a=
lternates:normal;vertical-align:baseline"><br></span><span style=3D"font-si=
ze:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:tran=
sparent;font-variant-numeric:normal;font-variant-east-asian:normal;font-var=
iant-alternates:normal;vertical-align:baseline">Ethan</span></span></div>

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