To: bitcoin-dev@lists.linuxfoundation.org
From: Andreas Schildbach <andreas@schildbach.de>
Date: Thu, 28 Sep 2017 16:13:48 +0200
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References: <20170927160654.GA12492@savin.petertodd.org>
	<oqihpf$5gc$1@blaine.gmane.org>
	<B5DE4E92-C5B3-4C01-A148-E3C46C897323@sprovoost.nl>
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Subject: Re: [bitcoin-dev] Address expiration times should be added to
	BIP-173
Precedence: list

On 09/28/2017 02:43 PM, Sjors Provoost via bitcoin-dev wrote:

>> This feels redundant to me; the payment protocol already has an
>> expiration time.
> 
> The BIP-70 payment protocol has significant overhead and most importantly requires back and forth. Emailing a bitcoin address or printing it on an invoice is much easier, so I would expect people to keep doing that.

The payment request message is just as one-way as an address is. It is
already being emailed and printed on an invoice, in fact it often acts
as the invoice.

Even more problematic, if you were to include an expiry date in a
BIP-173 address and put that into a payment request, wallets wouldn't be
allowed to parse that expiry date from the script without violating the
BIP70 spec.