From: Mike Hearn <mike@plan99•net>
To: Andreas Schildbach <andreas@schildbach•de>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Instant / contactless payments
Date: Thu, 6 Mar 2014 14:44:26 +0100 [thread overview]
Message-ID: <CANEZrP2GbnsqQANGKMW_5FAugppGJEksaB=Tf8Xu1nRLy3z9yg@mail.gmail.com> (raw)
In-Reply-To: <lf9m0e$q7t$1@ger.gmane.org>
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On Thu, Mar 6, 2014 at 12:26 PM, Andreas Schildbach
<andreas@schildbach•de>wrote:
> I'm not sure if iso-dep is the way to go here. Afaik as soon as you pick
> up the phone the connection breaks.
If the phone isn't willing to immediately authorise then it'd have to fall
back to HTTPS or Bluetooth as normal.
> Besides, how do you plan to risk-analyse the memo field?
>
I guess only the amount and destination are relevant for risk analysis.
> It's already very short if you can do without Android Beam, e.g. on
> Android 2.3.
I think IsoDep based protocols must bypass Beam - when I scan my e-passport
there's no beam animation.
> The most obvious optimization to speed up signature checking is to make
> it lazy. The user can already inspect the payment while signatures are
> being checked.
Well, for <400msec there can't be any user interaction. But checking
signatures on the payment request and constructing and signing the inputs
can all be done in parallel - you should be able to max out every core, at
least for a brief moment.
> Even the current ~10 second roundtrip is a huge improvement to the
> status quo. I recently tried to buy a subway ticket and it took me 7
> full minutes (just for the payment process)!
Then that subway kind of sucks ;) Have you been to London and used Oyster?
I think the capital wouldn't work at all without the low latency Oyster
cards. The tube would have stopped scaling some time ago.
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next prev parent reply other threads:[~2014-03-06 13:44 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-06 9:45 Mike Hearn
2014-03-06 11:26 ` Andreas Schildbach
2014-03-06 13:44 ` Mike Hearn [this message]
2014-03-06 14:51 ` Andreas Schildbach
2014-03-06 16:55 ` [Bitcoin-development] Instant / contactless payments, IsoDep Andreas Schildbach
2014-03-06 17:00 ` Mike Hearn
2014-03-07 8:45 ` Andreas Schildbach
2014-03-07 9:26 ` [Bitcoin-development] Instant / contactless payments Johannes Zweng
2014-03-07 10:00 ` Mike Hearn
2014-03-07 10:23 ` Andreas Schildbach
2014-03-07 11:01 ` Mike Hearn
2014-03-07 12:00 ` Johannes Zweng
2014-03-06 14:20 ` Brooks Boyd
2014-03-06 17:07 ` Mike Hearn
2014-03-06 18:08 ` Brooks Boyd
2014-03-06 18:12 ` Mike Hearn
2014-03-06 18:20 ` Brooks Boyd
2014-03-06 18:24 ` Mike Hearn
2014-03-07 18:07 ` Joel Kaartinen
2014-03-06 14:39 ` Alex Kotenko
2014-03-06 16:46 ` Andreas Schildbach
2014-03-06 16:52 ` Mike Hearn
2014-03-06 18:03 ` Alex Kotenko
2014-03-07 8:59 ` Andreas Schildbach
2014-03-06 17:03 ` Mike Hearn
2014-03-06 18:49 ` Alex Kotenko
2014-03-08 8:52 ` Jan Vornberger
2014-03-10 15:09 ` Alex Kotenko
2014-03-10 19:28 ` Andreas Schildbach
2014-03-10 19:47 ` Alex Kotenko
2014-03-07 19:08 ` Troy Benjegerdes
2014-03-10 16:04 ` Mike Hearn
2014-03-10 16:14 ` Jean-Paul Kogelman
2014-03-10 16:27 ` Alex Kotenko
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