Files
bitcoin/src
Wladimir J. van der Laan 5667b0d758 Merge #16792: Assert that the HRP is lowercase in Bech32::Encode
2457aea83c Assert that the HRP is lowercase in Bech32::Encode (Samuel Dobson)

Pull request description:

  From BIP-173:
  > The lowercase form is used when determining a character's value for checksum purposes.
  > Encoders MUST always output an all lowercase Bech32 string. If an uppercase version of the encoding result is desired, (e.g.- for presentation purposes, or QR code use), then an uppercasing procedure can be performed external to the encoding process.

  Currently if HRP contains uppercase characters, the checksum will be generated over these uppercase characters resulting in mixed-case output that will always be invalid even if the case is changed manually after encoding. This shouldn't happen because both prefix's `bc` and `tb` are lowercase currently, but we assert this condition anyway.

  This is consistent also with the [C reference implementation](2b0aac650c/ref/c/segwit_addr.c (L59))

ACKs for top commit:
  laanwj:
    ACK 2457aea83c

Tree-SHA512: 24fcbbc2f315c72c550cc3d82b4332443eea6378fc73d571f98b87492604d023378dd102377c9e05467192cae6049606dee98e4c5688c8d5e4caac50c970284b
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