Ben Westgate c201536604 BIP93: Correct checksum selection boundaries ...

Include the expanded human-readable part when selecting the codex32
checksum. This keeps regular codewords within the 93-symbol BCH period
and rejects the 94- and 95-symbol gap before the long checksum starts
at 96 symbols.

Split regular and long checksum construction and verification so their
periods can be tested independently. Add assertions for both selection
boundaries and the long checksum upper limit.

Refs: https://github.com/bitcoin/bips/pull/2258#issuecomment-5411804501

2026-08-25 17:52:47 -05:00

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