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From: Andreas Schildbach <andreas@schildbach.de>
Date: Fri, 29 Sep 2017 10:44:11 +0200
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Subject: Re: [bitcoin-dev] Address expiration times should be added to
	BIP-173
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On 09/29/2017 03:45 AM, Peter Todd via bitcoin-dev wrote:
> On Thu, Sep 28, 2017 at 12:09:59PM +0200, Andreas Schildbach via bitcoin-dev wrote:
>> This feels redundant to me; the payment protocol already has an
>> expiration time.
> 
> I'm well aware. As the payment protocol hasn't caught on - and doesn't fully
> overlap all the usecases that addresses do anyway - I think we should consider
> bringing this important feature to Bitcoin addresses too.

Hasn't caught on? It is used for virtually all merchant transactions,
plus person to person transactions between Bitcoin Wallet users.