new BIP: codex32 #1425

1. 
   apoelstra commented at 6:40 pm on February 20, 2023: contributor

   This introduces “codex32”, a wallet seed/share format that uses the bech32 alphabet, a bech32-like checksum, and supports Shamir Secret Sharing, all possible without the use of electronic computers (although you can, and for some steps probably should, use computers if you want).

   Mailing list discussion: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-February/021469.html Website with more docs about hand computation (which isn’t really covered by the BIP): https://secretcodex32.com/index.html

2. 
   roconnor-blockstream commented at 2:38 am on February 21, 2023: contributor

   Add a comment that notes that if you are resharing a secret by taking existing shares an recovering the secret, tossing out the old shares and making new ones, it is important to create a fresh unique ID. Without a fresh ID you run the risk of accidentally combining old shares with new shares (due to forgetting to destroy some old shares), which could lead to confusion and/or the apparent loss of funds.
3. 
   roconnor-blockstream commented at 4:14 am on February 21, 2023: contributor

   After discussion with Christopher Allen et. al., I’ve opened PR https://github.com/apoelstra/bips/pull/2 for adding a rationale section for not encoding BIP-0039 entropy.

   I suppose comments on that proposed amendment should be directed to that PR, while this PR remains open for assigning a BIP number and other comments on this proposal.

4. 
   roconnor-blockstream commented at 3:15 pm on February 21, 2023: contributor

   Recommend noting master xprvs in each test case.
5. in bip-0000.mediawiki:4 in 6ce70ec5ea outdated

   0@@ -0,0 +1,472 @@
   1+<pre>
   2+  BIP: ????
   3+  Layer: Applications
   4+  Title: codex32
   

   ---

   ---

   

   luke-jr commented at 5:08 pm on February 21, 2023:

   Would prefer a title that means something

   ---

   

   roconnor-blockstream commented at 6:27 pm on February 21, 2023:

   Yes.

   Maybe something like Codex32 format for Shamir Secret Shares of [BIP-0032] master seeds.

   ---

   

   apoelstra commented at 0:05 am on February 22, 2023:

   Sure. How about “codex32: a bech32-based BIP32 seed encoding supporting Shamir Secret Sharing and hand computation”?

   ---

   

   roconnor-blockstream commented at 1:25 am on February 22, 2023:

   SGTM.

   ---

   

   apoelstra commented at 1:27 am on February 22, 2023:

   Pushed.
6. apoelstra force-pushed on Feb 22, 2023
7. roconnor-blockstream cross-referenced this on Mar 4, 2023 from issue unicode normalization in BIP-39 by grondilu
8. 
   michaelfolkson commented at 12:05 pm on March 11, 2023: contributor

   It’d be nice to get SLIP39 BIPed as well as this at some point in the future (especially as this draft BIP references it) if that factors into the BIP number allocation and possible number grouping(s).
9. 
   vicariousdrama commented at 4:43 pm on March 12, 2023: none

   NACK - Not in keeping with the Bitcoin Philosophy
10. 
    luke-jr commented at 10:13 pm on March 15, 2023: member

    I stumbled across a memo from 93 BC that appears to say this has been assigned BIP number 93.
11. new BIP: codex32 599b26fe05
12. assign BIP #93; set type to "Informational" 5bbf0db981
13. apoelstra force-pushed on Mar 15, 2023
14. 
    apoelstra commented at 11:32 pm on March 15, 2023: contributor

    Thanks @luke-jr!

    I have squashed all the existing commits and added a new one which sets the number (and sets the type to “Informational”, which matches my intuition about this and also matches BIP 173, which is similar in spirit).

    We are not quite ready to merge – we have a new reference implementation we want to link to (with Postscript and Rust, for now) and we want to replace some test vectors with nicer ones done.

15. Updated set of invalid test vectors

    Using the identifier "faux" for invalid test vectors.
    
    Extending the set of example a little bit.

    04ce941c36
16. change title to fit under length limit b6821a4f28
17. apoelstra force-pushed on Mar 16, 2023
18. 
    kallewoof commented at 9:57 am on March 16, 2023: member

    Just a reminder to add the BIP entry to README.mediawiki as well.
19. add links to reference impls b5c0185dcc
20. add bip93 to README 7d73d30991
21. justinmoon cross-referenced this on Mar 16, 2023 from issue March Topics by benthecarman
22. roconnor-blockstream approved
23. 
    roconnor-blockstream commented at 4:05 pm on March 16, 2023: contributor

    LGTM
24. 
    apoelstra commented at 4:29 pm on March 16, 2023: contributor

    @kallewoof I think we are ready to merge this
25. apoelstra cross-referenced this on Mar 16, 2023 from issue Update BIP39 Comments-Summary by BitcoinErrorLog
26. kallewoof merged this on Mar 17, 2023
27. kallewoof closed this on Mar 17, 2023

    ---

28. apoelstra deleted the branch on Mar 17, 2023
29. nickfarrow cross-referenced this on Mar 30, 2023 from issue March 2023 Meeting Topics by nickfarrow

Contributors
apoelstra roconnor-blockstream luke-jr michaelfolkson vicariousdrama kallewoof