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bip389: remove H as valid hardened step indicator

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In BIP380 the capital letter H is explicitly defined as an invalid
indicator for a hardened step. The "Invalid expression" section has
explicit examples prefixed "Invalid hardened indicators" that show
"0H/0H/0H" as being wrong.
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Oli
2026-08-06 09:25:36 +02:00
parent 7517a8b2ac
commit 9570a72d50
1 changed files with 5 additions and 5 deletions
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@@ -38,12 +38,12 @@ For extended keys and their derivations paths in a Key Expression, BIP 380 state
This is modified to state:
* <tt>xpub</tt> encoded extended public key or <tt>xprv</tt> encoded extended private key (as defined in BIP 32)
** Followed by zero or more <tt>/NUM</tt> (may be followed by <tt>h</tt>, <tt>H</tt>, or <tt>'</tt> to indicate a hardened step) path elements indicating BIP 32 derivation steps to be taken after the given extended key.
** Followed by zero or one <tt>/<NUM;NUM</tt> (each <tt>NUM</tt> may be followed by <tt>h</tt>, <tt>H</tt>, or <tt>'</tt> to indicate a hardened step) path element indicating a tuple of BIP 32 derivation steps to be taken after the given extended key.
*** Followed by zero or more <tt>;NUM</tt> (may be followed by <tt>h</tt>, <tt>H</tt>, or <tt>'</tt> to indicate a hardened step) additional tuple values of BIP 32 derivation steps
** Followed by zero or more <tt>/NUM</tt> (may be followed by <tt>h</tt> or <tt>'</tt> to indicate a hardened step) path elements indicating BIP 32 derivation steps to be taken after the given extended key.
** Followed by zero or one <tt>/<NUM;NUM</tt> (each <tt>NUM</tt> may be followed by <tt>h</tt> or <tt>'</tt> to indicate a hardened step) path element indicating a tuple of BIP 32 derivation steps to be taken after the given extended key.
*** Followed by zero or more <tt>;NUM</tt> (may be followed by <tt>h</tt> or <tt>'</tt> to indicate a hardened step) additional tuple values of BIP 32 derivation steps
*** Followed by a single <tt>>/</tt>
** Followed by zero or more <tt>/NUM</tt> (may be followed by <tt>h</tt>, <tt>H</tt>, or <tt>'</tt> to indicate a hardened step) path elements indicating BIP 32 derivation steps to be taken after the given extended key.
** Optionally followed by a single <tt>/*</tt> (may be followed by <tt>h</tt>, <tt>H</tt>, or <tt>'</tt> to indicate a hardened step) final step to denote all direct unhardened or hardened children.
** Followed by zero or more <tt>/NUM</tt> (may be followed by <tt>h</tt> or <tt>'</tt> to indicate a hardened step) path elements indicating BIP 32 derivation steps to be taken after the given extended key.
** Optionally followed by a single <tt>/*</tt> (may be followed by <tt>h</tt> or <tt>'</tt> to indicate a hardened step) final step to denote all direct unhardened or hardened children.
When a <tt>/<NUM;NUM;...;NUM></tt> is encountered, parsers should account for a presence of multiple descriptors where the first descriptor uses the first <tt>NUM</tt>, and a second descriptor uses the second <tt>NUM</tt>, and so on, until each <tt>NUM</tt> is accounted for in the production of public keys, scripts, and addresses, as well as descriptor import and export operations.
Descriptors that contain multiple Key Expressions that each have a <tt>/<NUM;NUM;...;NUM></tt> must have tuples of exactly the same length so that they are derived in lockstep in the same way that <tt>/*</tt> paths in multiple Key expressions are handled.