* [bitcoindev] [BIP Proposal] Add BIP-0093 (Codex32) as application to BIP-0085
@ 2025-08-31 22:25 'Ben Westgate' via Bitcoin Development Mailing List
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From: 'Ben Westgate' via Bitcoin Development Mailing List @ 2025-08-31 22:25 UTC (permalink / raw)
To: Bitcoin Development Mailing List
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Hello bitcoin-dev,
I’m Ben Westgate, a contributor interested in deterministic wallet backups
and seed management.
Per BIP-0002, I propose listing *BIP-0093 (codex32)*
<https://github.com/bitcoin/bips/blob/master/bip-0093.mediawiki> as an
application of
*BIP-0085 (Deterministic Entropy from BIP32 Keychains)
<https://github.com/bitcoin/bips/blob/master/bip-0085.mediawiki>*, similar
to the existing BIP39 application. This allows wallets to derive codex32
backups from BIP-0032 master keys.
*Summary*
-
Application number: 93'
- Derivation path:
m/83696968'/93'/{hrp}'/{threshold}'/{n}'/{byte_length}'/{id0}'/{id1}'/{id2}'/{id3}'/{index}'
Codex32, defined in BIP-93, is a human-readable encoding with checksumming
and share indexing designed for SSS backups of BIP-0032 seeds. This PR
proposes a deterministic way to generate codex32 strings using BIP-85.
*Rationale*
-
Mirrors the existing BIP-85 application for BIP-39.
-
Codex32 offers error correction, hand verification, identifiers, and
secret sharing features compared to BIP-39.
-
Adds a standardized way for wallets to generate codex32 backups from
BIP-85-derived entropy
-
Test vectors and reference implementation are linked to in the PR.
*Risks and alternatives*
-
Wallet adoption of codex32 is still limited, though a draft PR #32652
<https://github.com/bitcoin/bitcoin/pull/32652?utm_source=chatgpt.com>
for importing codex32 strings to Bitcoin Core has support.
- Codex32 implementers could use the BIP-85 dice application, but
defining a direct application improves interoperability.
PR:
https://github.com/bitcoin/bips/compare/master...BenWestgate:bips:codex32
<https://github.com/bitcoin/bips/compare/master...BenWestgate:bips:codex32?utm_source=chatgpt.com>
Feedback is welcome.
Best regards,
Ben Westgate
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