[Bitcoin-development] Proposal for P2P Wireless (Bluetooth LE) transfer of Payment URI

Paul Puey paul at airbitz.co
Thu Feb 5 20:37:14 UTC 2015

Thanks for CC'ing me Mike. Having trouble receiving maillist list posts.

Even if a user could get the BIP70 URL in the URI, they would still need
internet to access the URL. This BLE spec doesn't preclude BIP70, but can
work with it while still allowing individuals without a certificate to
broadcast a request.

The issue of confused payments becomes less so if the Recipient broadcasts
a name along with the 10 digit public addr prefix. Only if there is a name
conflict will the user have to be concerned with the prefix. The name can
be something like

Mikes Coffee #1 and it can have a "Register #1" at the counter. A customer
facing screen can also show the 10 digit prefix.

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On Thu, Feb 5, 2015 at 12:28 PM, Mike Hearn <mike at plan99.net> wrote:

> BIP70 requests can be sent over bluetooth as well, as can transactions.
> Bitcoin Wallet can already send money even when offline by doing this. It's
> transparent to the user. I mean original Bluetooth in this context - BLE
> has incredibly tight data constraints and isn't really meant for data
> transfer.
> Yes Android Beam has a pretty stupid UI. You can actually tap the devices,
> take them away and then press, but that's not obvious at all. There have
> been new APIs added in recent releases that give more control over this, so
> it's possible we can revisit things and make the UI better these days.
> The donation to live performer example is good - there's no issue of
> accidentally paying for someone else in this context as there's only one
> recipient, but many senders.
> The issue of confused payments remains in other situations though.
> For the coffee shop use case, it'd be nicer (I think) if we aim for a
> Square-style UI where the device broadcasts a (link to) a photo of the user
> combined with a bluetooth MAC. Then the merchant tablet can show faces of
> people in the shop, and can push a payment request to the users device.
> That device can then buzz the user, show a confirmation screen, put
> something on their smart watch etc or just auto-authorise the payment
> because the BIP70 signature is from a trusted merchant. User never even
> needs to touch their phone at all.
> On Thu, Feb 5, 2015 at 9:06 PM, Paul Puey <paul at airbitz.co> wrote:
>> The BIP70 protocol would preclude individuals from utilizing the P2P
>> transfer spec. It would also require that a Sender have internet
>> connectivity to get the payment protocol info. BLE could enable payment w/o
>> internet by first transferring the URI to from Recipient to Sender. Then in
>> the future, we could sign a Tx and send it over BLE back to the recipient
>> (who would still need internet to verify the Tx). This is an important use
>> case for areas with poor 3G/4G connectivity as I've experience myself.
>> Also, due to Android issues, NFC is incredibly clunky. The URI Sender is
>> required to tap the screen *while* the two phones are in contact. We
>> support NFC the same way Bitcoin Wallet does, but unless the payment
>> recipient has a custom Android device (which a merchant might) then the
>> usage model is worse than scanning a QR code. BLE also allows people to pay
>> at a distance such as for a donation to a live performer. We'll look at
>> adding this to the Motivation section.
>> [image: logo]
>> *Paul Puey* CEO / Co-Founder, Airbitz Inc
>> +1-619-850-8624 | http://airbitz.co | San Diego
>> <http://facebook.com/airbitz>  <http://twitter.com/airbitz>
>> <https://plus.google.com/118173667510609425617>
>> <https://go.airbitz.co/comments/feed/>  <http://linkedin.com/in/paulpuey>
>>   <https://angel.co/paul-puey>
>>   <https://play.google.com/store/apps/details?id=com.airbitz>
>> <https://itunes.apple.com/us/app/airbitz/id843536046>
>> From: Andreas Schildbach <andreas at sc...> - 2015-02-05 13:47:04
>> Thanks Paul, for writing up your protocol!
>> First thoughts:
>> For a BIP standard, I think we should skip "bitcoin:" URIs entirely and
>> publish BIP70 payment requests instead. URIs mainly stick around because
>> of QR codes limited capacity. BIP70 would partly address the "copycat"
>> problem by signing payment requests.
>> In your Motivation section, I miss some words about NFC. NFC already
>> addresses all of the usability issues mentioned and is supported by
>> mobile wallets since 2011. That doesn't mean your method doesn't make
>> sense in some situations, but I think it should be explained why to
>> prefer broadcasting payment requests over picking them up via near field
>> radio.
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