Subject: [bitcoindev] Re: [BIP Proposal] Add BIP-0093 (Codex32) as application to BIP-0085

From: Javier Mateos <[email-masked]>
Date: Mon, 1 Sep 2025 01:41:24 -0700 (PDT)

Hi Ben,

Thank you for your proposal to integrate BIP-0093 (codex32) as an 
application within BIP-0085

Reviewing the specification,  I believe I see two areas where we could 
improve clarity for implementers:

1) The DRNG→5-bit extraction process could benefit from explicit pseudocode 
to avoid implementation variations
2) The rule 'threshold == 0 implies n == 1' currently appears as a note but 
could be clearer as a normative requirement"

Best Regards,
Javier Mateos

El domingo, 31 de agosto de 2025 a las 19:29:46 UTC-3, Ben Westgate 
escribió:

> 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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