I think I phrased this badly.

What I mean is that there should be a note that HRP should be specified in lowercase, or at least mention that uppercase and lowercase HRPs are considered equivalent and will be canonicalized to lowercase during validation.

On Thu, Jul 26, 2018 at 9:43 AM, Russell O'Connor <roconnor@blockstream.io> wrote:

Hi Pieter,

> The human-readable part, which is intended to convey the type of data, or anything else that is relevant to the reader. This part MUST contain 1 to 83 US-ASCII characters, with each character having a value in the range [33-126]. HRP validity may be further restricted by specific applications.

You should also add to this section that the HRP should be lowercase.

Since Bech32 forbids mixed-case and otherwise converts everything to lowercase, it is good to warn upfront against using uppercase in the HRP.

I know the BIP is marked as final, but this wouldn't be a normative change.