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From: "Russell O'Connor" <roconnor@blockstream.io>
Date: Thu, 26 Jul 2018 09:43:19 -0400
Message-ID: <CAMZUoK=sZ_b3SM1qiPfEF8uMRPCoY4LKcXit4Nd5Kb_aS9cVJQ@mail.gmail.com>
To: Pieter Wuille <pieter.wuille@gmail.com>
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Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] A BIP proposal for segwit addresses
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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.

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<div dir=3D"ltr"><div>Hi Pieter,</div><div><br></div><div>&gt; The <b>human=
-readable part</b>, which is intended to convey the type of=20
data, or anything else that is relevant to the reader. This part MUST=20
contain 1 to 83 US-ASCII characters, with each character having a value=20
in the range [33-126]. HRP validity may be further restricted by=20
specific applications.<br></div><div><br></div><div>You should also add to =
this section that the HRP should be lowercase.</div><div><br></div><div>Sin=
ce Bech32 forbids mixed-case and otherwise converts everything to lowercase=
, it is good to warn upfront against using uppercase in the HRP.</div><div>=
<br></div><div>I know the BIP is marked as final, but this wouldn&#39;t be =
a normative change.<br></div></div>

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