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From: Ethan Heilman <eth3rs@gmail.com>
Date: Fri, 18 Jul 2025 17:58:46 -0400
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Message-ID: <CAEM=y+WkLOVJ787jjr5zZgKsAHxHkgdZjANqGycEh4K7ZSddSA@mail.gmail.com>
Subject: [bitcoindev] Human meaningful witness versioning
To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
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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
the community is highly allergic to this idea.
Bech32 (BIP-0173
<https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki>) was
designed such that the Witness version is the first character in an address
after the =E2=80=9Cbc1=E2=80=9D address prefix
Witness Version 0: bc1q=E2=80=A6
Witness Version 1: bc1p=E2=80=A6
Witness version 2: bc1z=E2=80=A6
Witness version 3: bc1r=E2=80=A6
Witness version 4: bc1y=E2=80=A6
Witness version 5: bc19=E2=80=A6
Witness version 6: bc1x=E2=80=A6
Witness version 7: bc18=E2=80=A6
Witness version 8: bc1g=E2=80=A6
=E2=80=A6
So far we have been allocating Witness Versions in incrementing numeric
order (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.
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 nume=
rically
available 2, but I want to see how the community feels about it as a
general pattern for future softforks (z for compressed/zipped output, y for
yield outputs, etc=E2=80=A6).
Making it easier for users to understand the output type associated 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 flag
dangerous output types, some wallets may not invest in such functionality
or the user may be using a paper wallet. This is the same argument as
prefixing addresses with =E2=80=9Cbc=E2=80=9D for mainnet and =E2=80=9Ctc=
=E2=80=9D for testnet.
Note: the Witness version is sometimes called the SegWit version.
Thanks,
Ethan
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--0000000000001613c2063a3b3d83
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<div dir=3D"ltr"><span id=3D"gmail-docs-internal-guid-e6fd3131-7fff-2cae-18=
8f-81e79dfa4fb9"><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;ma=
rgin-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:normal;vertical-alig=
n:baseline">I want to propose a new criteria for allocating Witness version=
s based on human meaningfulness and see if there is support for this approa=
ch 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:norm=
al;font-variant-alternates:normal;vertical-align:baseline"><br><br></span><=
/p><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0p=
t"><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-e=
ast-asian:normal;font-variant-alternates:normal;vertical-align:baseline">Be=
ch32 (</span><a href=3D"https://github.com/bitcoin/bips/blob/master/bip-017=
3.mediawiki" style=3D"text-decoration-line:none"><span style=3D"font-size:1=
1pt;font-family:Arial,sans-serif;background-color:transparent;font-variant-=
numeric:normal;font-variant-east-asian:normal;font-variant-alternates:norma=
l;text-decoration-line:underline;vertical-align:baseline">BIP-0173</span></=
a><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-ea=
st-asian:normal;font-variant-alternates:normal;vertical-align:baseline">) w=
as designed such that the Witness version is the first character in an addr=
ess after the =E2=80=9Cbc1=E2=80=9D address prefix</span><span style=3D"fon=
t-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><br></span></p><p d=
ir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0pt"><spa=
n style=3D"font-size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);bac=
kground-color:transparent;font-variant-numeric:normal;font-variant-east-asi=
an:normal;font-variant-alternates:normal;vertical-align:baseline">Witness V=
ersion 0: bc1q=E2=80=A6</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"><br></span><span style=3D"font-size:11pt;font-fami=
ly:Arial,sans-serif;color:rgb(0,0,0);background-color:transparent;font-vari=
ant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:n=
ormal;vertical-align:baseline">Witness Version 1: bc1p=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-numeric:normal;font-variant-east-=
asian:normal;font-variant-alternates:normal;vertical-align:baseline">Witnes=
s 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-fam=
ily:Arial,sans-serif;color:rgb(0,0,0);background-color:transparent;font-var=
iant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:=
normal;vertical-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 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">Witne=
ss version 4: bc1y=E2=80=A6</span><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"><br></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-alternat=
es: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:0p=
t"><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-e=
ast-asian:normal;font-variant-alternates:normal;vertical-align:baseline">Wi=
tness version 6: bc1x=E2=80=A6</span></p><p dir=3D"ltr" style=3D"line-heigh=
t: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:normal;font-variant-alterna=
tes:normal;vertical-align:baseline">Witness version 7: bc18=E2=80=A6</span>=
</p><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;margin-bottom:0=
pt"><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">W=
itness version 8: bc1g=E2=80=A6</span></p><p dir=3D"ltr" style=3D"line-heig=
ht:1.38;margin-top:0pt;margin-bottom:0pt"><span style=3D"font-size:11pt;fon=
t-family:Arial,sans-serif;color:rgb(0,0,0);background-color:transparent;fon=
t-variant-numeric:normal;font-variant-east-asian:normal;font-variant-altern=
ates:normal;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-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">So far we have been=
allocating Witness Versions in incrementing numeric order (0,1,...). I wan=
t to suggest we allocate Witness Versions mnemonic to make it easier to loo=
k at an address 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-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">This originally cam=
e up over the question of if BIP-360 should use Witness Version 3 to get bc=
1r=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 f=
or future softforks (z for compressed/zipped output, y for yield outputs, e=
tc=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-serif;color:rgb(0,0,0);background-color:transparent;font-variant-nume=
ric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;ve=
rtical-align:baseline">Making it easier for users to understand the output =
type associated is likely to grow in importance over time as we retire outp=
ut types, add policy restricting the relay of certain output types or outpu=
t types become insecure due to cryptanalytic breaks. While wallet software =
should flag dangerous output types, some wallets may not invest in such fun=
ctionality or the user may be using a paper wallet. This is the same argume=
nt as prefixing 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;fon=
t-family:Arial,sans-serif;color:rgb(0,0,0);background-color:transparent;fon=
t-variant-numeric:normal;font-variant-east-asian:normal;font-variant-altern=
ates:normal;vertical-align:baseline">Note: the Witness version is sometimes=
called the SegWit version.</span><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"><br></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-alternat=
es:normal;vertical-align:baseline"><br></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-al=
ternates:normal;vertical-align:baseline">Thanks,</span><span style=3D"font-=
size:11pt;font-family:Arial,sans-serif;color:rgb(0,0,0);background-color:tr=
ansparent;font-variant-numeric:normal;font-variant-east-asian:normal;font-v=
ariant-alternates:normal;vertical-align:baseline"><br></span><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">Ethan</span></span>=
</div>
<p></p>
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