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From: "'Ava Chow' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
Subject: Re: [bitcoindev] Human meaningful witness versioning
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Hi Ethan,
I do not think that this is a good idea, and it undermines one of the=20
ways that witness programs provide us flexibility when deploying soft=20
forks in the form of varying witness program lengths.
Both witness version 0 and version 1 define consensus rules for the pair=20
of witness version and size of the witness program. A P2WPKH address and=20
a P2WSH address have very different meanings, yet share the same witness=20
version and therefore the same bc1q prefix. Their different rules are=20
applied depending on the size of the witness program.
While BIP 141 explicitly disallows the disallows the usage of other=20
sizes when it defined version 0, BIP 341 made no such restrictions on=20
version 1. Instead, the rules defined in BIP 341 only apply to witness=20
programs of 32 bytes, thus allowing new rules to be applied to witness=20
programs of other sizes that are also version 1.
We have already seen such a proposal be deployed - Pay to Anchor outputs=20
use witness version 1 with a 2 byte witness program of a particular value.
If the witness version were chosen based on a mnemonic, then we largely=20
lose the ability to define new rules for different sized witness=20
programs of already in use witness versions. Such usage would cause=20
mnemonics to lose their meaning, unless we expect users to also be=20
checking the length of addresses, and I don't think that's a reasonable=20
expectation.
Ava
On 07/18/2025 02:58 PM, Ethan Heilman wrote:
> I want to propose a new criteria for allocating Witness versions based=20
> on human meaningfulness and see if there is support for this approach or=
=20
> if the community is highly allergic to this idea.
>=20
> Bech32 (BIP-0173 <https://github.com/bitcoin/bips/blob/master/=20
> bip-0173.mediawiki>) was designed such that the Witness version is the=20
> first character in an address after the =E2=80=9Cbc1=E2=80=9D address pre=
fix
>=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
> So far we have been allocating Witness Versions in incrementing numeric=
=20
> order (0,1,...). I want to suggest we allocate Witness Versions mnemonic=
=20
> to make it easier to look at an address and determine the output type.
>=20
>=20
> This originally came up over the question of if BIP-360 should use=20
> Witness Version 3 to get bc1r=E2=80=A6 for P2QRH (r for resistant) or the=
next=20
> numerically available 2, but I want to see how the community feels about=
=20
> it as a general pattern for future softforks (z for compressed/zipped=20
> output, y for yield outputs, etc=E2=80=A6).
>=20
>=20
> Making it easier for users to understand the output type associated is=20
> likely to grow in importance over time as we retire output types, add=20
> policy restricting the relay of certain output types or output types=20
> become insecure due to cryptanalytic breaks. While wallet software=20
> should flag dangerous output types, some wallets may not invest in such=
=20
> functionality or the user may be using a paper wallet. This is the same=
=20
> argument as prefixing addresses with =E2=80=9Cbc=E2=80=9D for mainnet and=
=E2=80=9Ctc=E2=80=9D for testnet.
>=20
>=20
> Note: the Witness version is sometimes called the SegWit version.
>=20
> Thanks,
> Ethan
>=20
> --=20
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