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Date: Sun, 31 Aug 2025 15:25:47 -0700 (PDT)
From: "'Ben Westgate' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
To: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Message-Id: <774faeb9-6c6b-4545-8071-56ec03e78cd0n@googlegroups.com>
Subject: [bitcoindev] [BIP Proposal] Add BIP-0093 (Codex32) as application to BIP-0085
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Hello bitcoin-dev,
I=E2=80=99m Ben Westgate, a contributor interested in deterministic wallet =
backups=20
and seed management.
Per BIP-0002, I propose listing *BIP-0093 (codex32)*=20
<https://github.com/bitcoin/bips/blob/master/bip-0093.mediawiki> as an=20
application of
*BIP-0085 (Deterministic Entropy from BIP32 Keychains)=20
<https://github.com/bitcoin/bips/blob/master/bip-0085.mediawiki>*, similar=
=20
to the existing BIP39 application. This allows wallets to derive codex32=20
backups from BIP-0032 master keys.
*Summary*=20
-=20
=20
Application number: 93'
- Derivation path:=20
m/83696968'/93'/{hrp}'/{threshold}'/{n}'/{byte_length}'/{id0}'/{id1}'/{i=
d2}'/{id3}'/{index}'=20
=20
Codex32, defined in BIP-93, is a human-readable encoding with checksumming=
=20
and share indexing designed for SSS backups of BIP-0032 seeds. This PR=20
proposes a deterministic way to generate codex32 strings using BIP-85.
*Rationale*=20
-=20
=20
Mirrors the existing BIP-85 application for BIP-39.
-=20
=20
Codex32 offers error correction, hand verification, identifiers, and=20
secret sharing features compared to BIP-39.
-=20
=20
Adds a standardized way for wallets to generate codex32 backups from=20
BIP-85-derived entropy
-=20
=20
Test vectors and reference implementation are linked to in the PR.
=20
*Risks and alternatives*=20
-=20
=20
Wallet adoption of codex32 is still limited, though a draft PR #32652=20
<https://github.com/bitcoin/bitcoin/pull/32652?utm_source=3Dchatgpt.com>=
=20
for importing codex32 strings to Bitcoin Core has support.
- Codex32 implementers could use the BIP-85 dice application, but=20
defining a direct application improves interoperability.
PR:=20
https://github.com/bitcoin/bips/compare/master...BenWestgate:bips:codex32=
=20
<https://github.com/bitcoin/bips/compare/master...BenWestgate:bips:codex32?=
utm_source=3Dchatgpt.com>
Feedback is welcome.
Best regards,
Ben Westgate
--=20
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To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/=
774faeb9-6c6b-4545-8071-56ec03e78cd0n%40googlegroups.com.
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Content-Transfer-Encoding: quoted-printable
<p>Hello bitcoin-dev,</p>
<p>I=E2=80=99m Ben Westgate, a contributor interested in deterministic wall=
et backups and seed management.</p>
<p>Per BIP-0002, I propose listing <a href=3D"https://github.com/bitcoin/bi=
ps/blob/master/bip-0093.mediawiki"><strong>BIP-0093 (codex32)</strong></a> =
as an application of<br />
<strong><a href=3D"https://github.com/bitcoin/bips/blob/master/bip-0085.med=
iawiki">BIP-0085 (Deterministic Entropy from BIP32 Keychains)</a></strong>,=
similar to the existing BIP39 application. This allows
wallets to derive codex32 backups from BIP-0032 master keys.</p>
<p><span><b>Summary</b></span>
</p><ul><li>
<p>Application number: <span>93'</span></p>
</li><li>
Derivation path: <span>m/83696968'/93'/{hrp}'/{threshold}'/{n}'/{byte_lengt=
h}'/{id0}'/{id1}'/{id2}'/{id3}'/{index}'</span> <br /></li></ul><p>Codex32,=
defined in BIP-93, is a human-readable encoding with checksumming and shar=
e indexing designed for SSS backups of BIP-0032 seeds. This PR proposes a d=
eterministic way to generate codex32 strings using BIP-85.</p>
<p><span><b>Rationale</b></span>
</p><ul><li>
<p>Mirrors the existing BIP-85 application for BIP-39.</p>
</li><li>
<p>Codex32 offers error correction, hand verification, identifiers, and sec=
ret sharing features compared to BIP-39.</p>
</li><li>
<p>Adds a standardized way for wallets to generate codex32 backups from BIP=
-85-derived entropy<br /></p>
</li><li>
<p>Test vectors and reference implementation are linked to in the PR.<br />=
</p></li></ul><p>
</p><p><b><span>Risks and alternatives</span></b>
</p><ul><li>
<p>Wallet adoption of codex32 is still limited, though a draft <a rel=3D"no=
opener" href=3D"https://github.com/bitcoin/bitcoin/pull/32652?utm_source=3D=
chatgpt.com">PR #32652</a> for importing codex32 strings to Bitcoin Core ha=
s support.</p></li><li>Codex32 implementers could use the BIP-85 dice appli=
cation, but defining a direct application improves interoperability.</li></=
ul><p>PR: <a rel=3D"noopener" href=3D"https://github.com/bitcoin/bips/compa=
re/master...BenWestgate:bips:codex32?utm_source=3Dchatgpt.com">https://gith=
ub.com/bitcoin/bips/compare/master...BenWestgate:bips:codex32</a></p><p>Fee=
dback is welcome.</p>Best regards,<br />Ben Westgate
<p></p>
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