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Subject: [Bitcoin-development] Proposal for P2P Wireless (Bluetooth LE)
	transfer of Payment URI
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Airbitz has developed and implemented a method for communicating a bitcoin
URI across Bluetooth (BLE) or any other P2P, mid range, wireless, broadcast
medium. The currently documented implementation is available in our iOS and
Android mobile wallet (updated Android version with BLE coming in about 1
week). We would like to have the BIP pulled into Github for review and
discussion. Here is the current BIP:


BIP: TBD

Title: P2P Wireless URI transfer

Authors: Thomas Baker <tom=E2=80=99at=E2=80=99airbitz.co>, Paul Puey <paul=
=E2=80=99at=E2=80=99airbitz.co>

Contributors: Joey Krug <joeykrug=E2=80=99at=E2=80=99gmail.com>

Status: proposal

Type: Standards Track

Created: 2015-01-12

Table of Contents

   -

   Abstract
   -

   Motivation
   -

   Specification
   -

   Compatibility
   -

   Examples
   -

   References

Abstract

This is a protocol for peer-to-peer wireless transfer of a URI request
using an open broadcast or advertisement channel such as Bluetooth,
Bluetooth Low Energy, or WiFi Direct.
Motivation

There are disadvantages for a merchant (requester) and customer (sender) to
exchange a URI request using QR codes that can be eliminated by using
wireless broadcast or advertisements.

Current QR code scan method to transfer a request URI from merchant
(Requester) to customer (Sender) is cumbersome. A usual scenario is a
merchant with a POS terminal for order entry and a separate tablet for
transacting payments with bitcoin, and a customer with a smartphone. After
the order is entered, the merchant enters payment request information into
the tablet, generates the QR code representing the URI, and presents this
to the customer. The customer prepares to scan the QR code with their
smartphone by maneuvering the camera to the tablet. The tablet screen must
be relatively clean, point at the customer, and held steady. The smartphone
camera lens must be clean, point at the tablet screen, come into range, and
held steady to focus and wait for a QR scan. Environmental conditions such
as bright outdoor sunlight, indoor spot lights, or significant distance
between QR code and camera can create difficult and cumbersome experiences
for users.

Using a wireless local broadcast allows the merchant to just enter the
payment and wait. The tablet and smartphone are not maneuvered to align in
any way. The customer observes broadcast listings, selects the appropriate
one from possible simultaneous broadcasts from other POS stations nearby,
examines the URI request details such as amount, and decides whether to
send funds, initiating a bitcoin network transfer. The merchant and
customer then receive the transaction confirmations and are done with the
sale. Merchant and customer devices are kept private and secured in their
own possession.

The URI and other broadcast identification (Joe=E2=80=99s Grill #1) only co=
ntain
public information. However, a copycat broadcaster acting as MITM might
duplicate the broadcast simultaneously as the merchant, attempting to lure
the customer to send funds to the copycat. That attack is mitigated with
this broadcast method because of the partial address in the broadcast.
Specification

Requester generates a bitcoin URI request of variable length, and a limited
descriptive identifier string. Requester then broadcasts the URI=E2=80=99s =
partial
public address (<paddress>) plus identifier (<id>) over a publicly visible
wireless channel.

Sender scans for broadcasts on their device, examines and selects the
desired request by the identifier and partial address. This connects a data
channel to Requester.

Requester sends full URI back over the data channel.

Sender device ensures <paddress> is part of the full URI public address and
checks the full address integrity. Checking the broadcast and full URI
integrity prevents a copycat device within range from copying the partial
address and fooling the customer into sending funds to the copycat instead.

Below is a description of the protocol through Bluetooth Smart (Low Energy)=
.

Requestor      Sender     - Bitcoin transaction roles

Peripheral     Central    - Bluetooth GAP definitions

  Mode           Mode

1   |------------->|       - Requestor Advertises partial bitcoin: URI +
Name

   |     ...      |

2   |<-------------|       - Subscribe then send sender's Name, requesting
a response

3   |------------->|       - ACK

4   |<-------------|       - request Read Characteristic from peripheral

5   |------------->|       - Sender receives full bitcoin: URI


   1.

   Peripheral advertises over a service UUID a BLE extended advertisement
   with a Scan Response containing the partial address of a bitcoin URI and=
 a
   Name, any plain text. The entire response is limited to 26 characters. T=
he
   first 10 make up the first 10 characters of the bitcoin URI public addre=
ss
   where to send bitcoin, and must be present. The remaining characters are
   any plain text such as =E2=80=9CThe Habit 1=E2=80=9D or =E2=80=9CStarbuc=
ks-Reg 1=E2=80=9D, more human
   readable information. The partial address serves as a check against a
   nearby attacker who may try to lure a Sender into sending payment to a
   separate wallet by advertising a similar Scan Response but cannot replic=
ate
   a public address with the same leading 10 characters and different trail=
ing
   characters.
   2.

   When the Central scans the advertisement, it may display the Scan
   Response in a human readable listing using the two pieces of information=
.
   If Central chooses this advertisement to receive the full request, it th=
en
   subscribes to the service and writes the characteristic (a second UUID)
   with it=E2=80=99s own name, or a blank if not sending a name, to the Per=
ipheral.
   3.

   Peripheral gets a characteristic write request of the Central=E2=80=99s =
name,
   and acknowledges the receipt by sending a server response.
   4.

   Central receives a characteristic write (from the response) and
   immediately requests the entire bitcoin URI by issuing a read request on
   that characteristic.
   5.

   Peripheral receives the read request and sends the entire bitcoin URI
   over that characteristic up to 512 bytes.

This ends the proposed specification as the bitcoin URI transfer is
complete. The Sender would then normally confirm the request and decide
whether to initiate the fund transfer.
Compatibility

There are no prior BIPs covering this.
Examples

Airbitz iOS Bluetooth Low Energy to Bluetooth Low Energy request transfer.
References



[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>
*DOWNLOAD THE AIRBITZ WALLET:*
  <https://play.google.com/store/apps/details?id=3Dcom.airbitz>
<https://itunes.apple.com/us/app/airbitz/id843536046>

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<div dir=3D"ltr">Airbitz has developed and implemented a method for communi=
cating a bitcoin URI across Bluetooth (BLE) or any other P2P, mid range, wi=
reless, broadcast medium. The currently documented implementation is availa=
ble in our iOS and Android mobile wallet (updated Android version with BLE =
coming in about 1 week). We would like to have the BIP pulled into Github f=
or review and discussion. Here is the current BIP:<div><br><div><br></div><=
div><span id=3D"docs-internal-guid-9f096b22-58c0-7e5e-4500-8da4d4c7735e"><p=
 dir=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bottom:0pt"><span=
 style=3D"font-size:15px;font-family:Consolas;color:rgb(51,51,51);vertical-=
align:baseline;white-space:pre-wrap;background-color:transparent">BIP: TBD<=
/span></p><p dir=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-botto=
m:0pt"><span style=3D"font-size:15px;font-family:Consolas;color:rgb(51,51,5=
1);vertical-align:baseline;white-space:pre-wrap;background-color:transparen=
t">Title: P2P Wireless URI transfer</span></p><p dir=3D"ltr" style=3D"line-=
height:1;margin-top:0pt;margin-bottom:0pt"><span style=3D"font-size:15px;fo=
nt-family:Consolas;color:rgb(51,51,51);vertical-align:baseline;white-space:=
pre-wrap;background-color:transparent">Authors: Thomas Baker &lt;tom=E2=80=
=99at=E2=80=99<a href=3D"http://airbitz.co">airbitz.co</a>&gt;, Paul Puey &=
lt;paul=E2=80=99at=E2=80=99<a href=3D"http://airbitz.co">airbitz.co</a>&gt;=
</span></p><p dir=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bott=
om:0pt"><span style=3D"font-size:15px;font-family:Consolas;color:rgb(51,51,=
51);vertical-align:baseline;white-space:pre-wrap;background-color:transpare=
nt">Contributors: Joey Krug &lt;joeykrug=E2=80=99at=E2=80=99<a href=3D"http=
://gmail.com">gmail.com</a>&gt;</span></p><p dir=3D"ltr" style=3D"line-heig=
ht:1;margin-top:0pt;margin-bottom:0pt"><span style=3D"font-size:15px;font-f=
amily:Consolas;color:rgb(51,51,51);vertical-align:baseline;white-space:pre-=
wrap;background-color:transparent">Status: proposal</span></p><p dir=3D"ltr=
" style=3D"line-height:1;margin-top:0pt;margin-bottom:0pt"><span style=3D"f=
ont-size:15px;font-family:Consolas;color:rgb(51,51,51);vertical-align:basel=
ine;white-space:pre-wrap;background-color:transparent">Type: Standards Trac=
k</span></p><p dir=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bot=
tom:0pt"><span style=3D"font-size:15px;font-family:Consolas;color:rgb(51,51=
,51);vertical-align:baseline;white-space:pre-wrap;background-color:transpar=
ent">Created: 2015-01-12</span></p><br><div dir=3D"ltr" style><table style=
=3D"border:none;border-collapse:collapse"><colgroup><col width=3D"644"></co=
lgroup><tbody><tr style=3D"height:0px"><td style=3D"border:1px solid rgb(22=
1,221,221);vertical-align:top;padding:7px 13px"><h2 dir=3D"ltr" style=3D"li=
ne-height:1.225;margin-top:18pt;margin-bottom:24pt"><span style=3D"font-siz=
e:43px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;white-=
space:pre-wrap;background-color:transparent">Table of Contents</span></h2><=
ul style=3D"margin-top:0pt;margin-bottom:0pt"><li dir=3D"ltr" style=3D"list=
-style-type:circle;font-size:16px;font-family:Arial;color:rgb(51,51,51);ver=
tical-align:baseline;background-color:transparent"><p dir=3D"ltr" style=3D"=
line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style=3D"vertical-=
align:baseline;white-space:pre-wrap;background-color:transparent">Abstract<=
/span></p></li><li dir=3D"ltr" style=3D"list-style-type:circle;font-size:16=
px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;background=
-color:transparent"><p dir=3D"ltr" style=3D"line-height:1.15;margin-top:0pt=
;margin-bottom:0pt"><span style=3D"vertical-align:baseline;white-space:pre-=
wrap;background-color:transparent">Motivation</span></p></li><li dir=3D"ltr=
" style=3D"list-style-type:circle;font-size:16px;font-family:Arial;color:rg=
b(51,51,51);vertical-align:baseline;background-color:transparent"><p dir=3D=
"ltr" style=3D"line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span sty=
le=3D"vertical-align:baseline;white-space:pre-wrap;background-color:transpa=
rent">Specification</span></p></li><li dir=3D"ltr" style=3D"list-style-type=
:circle;font-size:16px;font-family:Arial;color:rgb(51,51,51);vertical-align=
:baseline;background-color:transparent"><p dir=3D"ltr" style=3D"line-height=
:1.15;margin-top:0pt;margin-bottom:0pt"><span style=3D"vertical-align:basel=
ine;white-space:pre-wrap;background-color:transparent">Compatibility</span>=
</p></li><li dir=3D"ltr" style=3D"list-style-type:circle;font-size:16px;fon=
t-family:Arial;color:rgb(51,51,51);vertical-align:baseline;background-color=
:transparent"><p dir=3D"ltr" style=3D"line-height:1.15;margin-top:0pt;margi=
n-bottom:0pt"><span style=3D"vertical-align:baseline;white-space:pre-wrap;b=
ackground-color:transparent">Examples</span></p></li><li dir=3D"ltr" style=
=3D"list-style-type:circle;font-size:16px;font-family:Arial;color:rgb(51,51=
,51);vertical-align:baseline;background-color:transparent"><p dir=3D"ltr" s=
tyle=3D"line-height:1.15;margin-top:0pt;margin-bottom:24pt"><span style=3D"=
vertical-align:baseline;white-space:pre-wrap;background-color:transparent">=
References</span></p></li></ul></td></tr></tbody></table></div><h2 dir=3D"l=
tr" style=3D"line-height:1.225;margin-top:17pt;margin-bottom:12pt"><span st=
yle=3D"font-size:40px;font-family:Arial;color:rgb(51,51,51);vertical-align:=
baseline;white-space:pre-wrap;background-color:transparent">Abstract</span>=
</h2><p dir=3D"ltr" style=3D"line-height:1.60000002384186;margin-top:0pt;ma=
rgin-bottom:12pt"><span style=3D"font-size:16px;font-family:Arial;color:rgb=
(51,51,51);vertical-align:baseline;white-space:pre-wrap;background-color:tr=
ansparent">This is a protocol for peer-to-peer wireless transfer of a URI r=
equest using an open broadcast or advertisement channel such as Bluetooth, =
Bluetooth Low Energy, or WiFi Direct.</span></p><h2 dir=3D"ltr" style=3D"li=
ne-height:1.225;margin-top:17pt;margin-bottom:12pt"><span style=3D"font-siz=
e:40px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;white-=
space:pre-wrap;background-color:transparent">Motivation</span></h2><p dir=
=3D"ltr" style=3D"line-height:1.60000002384186;margin-top:0pt;margin-bottom=
:12pt"><span style=3D"font-size:16px;font-family:Arial;color:rgb(51,51,51);=
vertical-align:baseline;white-space:pre-wrap;background-color:transparent">=
There are disadvantages for a merchant (requester) and customer (sender) to=
 exchange a URI request using QR codes that can be eliminated by using wire=
less broadcast or advertisements.</span></p><p dir=3D"ltr" style=3D"line-he=
ight:1.60000002384186;margin-top:0pt;margin-bottom:12pt"><span style=3D"fon=
t-size:16px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;w=
hite-space:pre-wrap;background-color:transparent">Current QR code scan meth=
od to transfer a request URI from merchant (Requester) to customer (Sender)=
 is cumbersome. A usual scenario is a merchant with a POS terminal for orde=
r entry and a separate tablet for transacting payments with bitcoin, and a =
customer with a smartphone. After the order is entered, the merchant enters=
 payment request information into the tablet, generates the QR code represe=
nting the URI, and presents this to the customer. The customer prepares to =
scan the QR code with their smartphone by maneuvering the camera to the tab=
let. The tablet screen must be relatively clean, point at the customer, and=
 held steady. The smartphone camera lens must be clean, point at the tablet=
 screen, come into range, and held steady to focus and wait for a QR scan. =
Environmental conditions such as bright outdoor sunlight, indoor spot light=
s, or significant distance between QR code and camera can create difficult =
and cumbersome experiences for users.</span></p><p dir=3D"ltr" style=3D"lin=
e-height:1.60000002384186;margin-top:0pt;margin-bottom:12pt"><span style=3D=
"font-size:16px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseli=
ne;white-space:pre-wrap;background-color:transparent">Using a wireless loca=
l broadcast allows the merchant to just enter the payment and wait. The tab=
let and smartphone are not maneuvered to align in any way. The customer obs=
erves broadcast listings, selects the appropriate one from possible simulta=
neous broadcasts from other POS stations nearby, examines the URI request d=
etails such as amount, and decides whether to send funds, initiating a bitc=
oin network transfer. The merchant and customer then receive the transactio=
n confirmations and are done with the sale. Merchant and customer devices a=
re kept private and secured in their own possession.</span></p><p dir=3D"lt=
r" style=3D"line-height:1.60000002384186;margin-top:0pt;margin-bottom:12pt"=
><span style=3D"font-size:16px;font-family:Arial;color:rgb(51,51,51);vertic=
al-align:baseline;white-space:pre-wrap;background-color:transparent">The UR=
I and other broadcast identification (Joe=E2=80=99s Grill #1) only contain =
public information. However, a copycat broadcaster acting as MITM might dup=
licate the broadcast simultaneously as the merchant, attempting to lure the=
 customer to send funds to the copycat. That attack is mitigated with this =
broadcast method because of the partial address in the broadcast.</span></p=
><h2 dir=3D"ltr" style=3D"line-height:1.225;margin-top:17pt;margin-bottom:1=
2pt"><span style=3D"font-size:40px;font-family:Arial;color:rgb(51,51,51);ve=
rtical-align:baseline;white-space:pre-wrap;background-color:transparent">Sp=
ecification</span></h2><p dir=3D"ltr" style=3D"line-height:1.60000002384186=
;margin-top:0pt;margin-bottom:12pt"><span style=3D"font-size:16px;font-fami=
ly:Arial;color:rgb(51,51,51);vertical-align:baseline;white-space:pre-wrap;b=
ackground-color:transparent">Requester generates a bitcoin URI request of v=
ariable length, and a limited descriptive identifier string. Requester then=
 broadcasts the URI=E2=80=99s partial public address (&lt;paddress&gt;) plu=
s identifier (&lt;id&gt;) over a publicly visible wireless channel.</span><=
/p><p dir=3D"ltr" style=3D"line-height:1.60000002384186;margin-top:0pt;marg=
in-bottom:12pt"><span style=3D"font-size:16px;font-family:Arial;color:rgb(5=
1,51,51);vertical-align:baseline;white-space:pre-wrap;background-color:tran=
sparent">Sender scans for broadcasts on their device, examines and selects =
the desired request by the identifier and partial address. This connects a =
data channel to Requester.</span></p><p dir=3D"ltr" style=3D"line-height:1.=
60000002384186;margin-top:0pt;margin-bottom:12pt"><span style=3D"font-size:=
16px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;white-sp=
ace:pre-wrap;background-color:transparent">Requester sends full URI back ov=
er the data channel.</span></p><p dir=3D"ltr" style=3D"line-height:1.600000=
02384186;margin-top:0pt;margin-bottom:12pt"><span style=3D"font-size:16px;f=
ont-family:Arial;color:rgb(51,51,51);vertical-align:baseline;white-space:pr=
e-wrap;background-color:transparent">Sender device ensures &lt;paddress&gt;=
 is part of the full URI public address and checks the full address integri=
ty. Checking the broadcast and full URI integrity prevents a copycat device=
 within range from copying the partial address and fooling the customer int=
o sending funds to the copycat instead.</span></p><p dir=3D"ltr" style=3D"l=
ine-height:1.60000002384186;margin-top:0pt;margin-bottom:12pt"><span style=
=3D"font-size:16px;font-family:Arial;color:rgb(51,51,51);vertical-align:bas=
eline;white-space:pre-wrap;background-color:transparent">Below is a descrip=
tion of the protocol through Bluetooth Smart (Low Energy).</span></p><p dir=
=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bottom:0pt"><span sty=
le=3D"font-size:13px;font-family:&#39;Courier New&#39;;color:rgb(51,51,51);=
vertical-align:baseline;white-space:pre-wrap;background-color:transparent">=
 Requestor =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Sender =C2=A0=C2=A0=C2=A0=C2=A0- B=
itcoin transaction roles</span></p><p dir=3D"ltr" style=3D"line-height:1;ma=
rgin-top:0pt;margin-bottom:0pt"><span style=3D"font-size:13px;font-family:&=
#39;Courier New&#39;;color:rgb(51,51,51);vertical-align:baseline;white-spac=
e:pre-wrap;background-color:transparent"> Peripheral =C2=A0=C2=A0=C2=A0=C2=
=A0Central =C2=A0=C2=A0=C2=A0- Bluetooth GAP definitions</span></p><p dir=
=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bottom:0pt"><span sty=
le=3D"font-size:13px;font-family:&#39;Courier New&#39;;color:rgb(51,51,51);=
vertical-align:baseline;white-space:pre-wrap;background-color:transparent">=
 =C2=A0=C2=A0Mode =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0Mode</span></p><p dir=3D"ltr" style=3D"line-height:1;margin-top:0pt;marg=
in-bottom:0pt"><span style=3D"font-size:13px;font-family:&#39;Courier New&#=
39;;color:rgb(51,51,51);vertical-align:baseline;white-space:pre-wrap;backgr=
ound-color:transparent">1 =C2=A0=C2=A0|-------------&gt;| =C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0- Requestor Advertises partial bitcoin: URI + Name</sp=
an></p><p dir=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bottom:0=
pt"><span style=3D"font-size:13px;font-family:&#39;Courier New&#39;;color:r=
gb(51,51,51);vertical-align:baseline;white-space:pre-wrap;background-color:=
transparent"> =C2=A0=C2=A0=C2=A0| =C2=A0=C2=A0=C2=A0=C2=A0... =C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0| =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0</span></p><p dir=
=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bottom:0pt"><span sty=
le=3D"font-size:13px;font-family:&#39;Courier New&#39;;color:rgb(51,51,51);=
vertical-align:baseline;white-space:pre-wrap;background-color:transparent">=
2 =C2=A0=C2=A0|&lt;-------------| =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0- Sub=
scribe then send sender&#39;s Name, requesting a response</span></p><p dir=
=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bottom:0pt"><span sty=
le=3D"font-size:13px;font-family:&#39;Courier New&#39;;color:rgb(51,51,51);=
vertical-align:baseline;white-space:pre-wrap;background-color:transparent">=
3 =C2=A0=C2=A0|-------------&gt;| =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0- ACK=
</span></p><p dir=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bott=
om:0pt"><span style=3D"font-size:13px;font-family:&#39;Courier New&#39;;col=
or:rgb(51,51,51);vertical-align:baseline;white-space:pre-wrap;background-co=
lor:transparent">4 =C2=A0=C2=A0|&lt;-------------| =C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0- request Read Characteristic from peripheral</span></p><p dir=
=3D"ltr" style=3D"line-height:1;margin-top:0pt;margin-bottom:0pt"><span sty=
le=3D"font-size:13px;font-family:&#39;Courier New&#39;;color:rgb(51,51,51);=
vertical-align:baseline;white-space:pre-wrap;background-color:transparent">=
5 =C2=A0=C2=A0|-------------&gt;| =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0- Sen=
der receives full bitcoin: URI</span></p><br><ol style=3D"margin-top:0pt;ma=
rgin-bottom:0pt"><li dir=3D"ltr" style=3D"list-style-type:decimal;font-size=
:16px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;backgro=
und-color:transparent"><p dir=3D"ltr" style=3D"line-height:1.60000002384186=
;margin-top:0pt;margin-bottom:0pt"><span style=3D"vertical-align:baseline;w=
hite-space:pre-wrap;background-color:transparent">Peripheral advertises ove=
r a service UUID a BLE extended advertisement with a Scan Response containi=
ng the partial address of a bitcoin URI and a Name, any plain text. The ent=
ire response is limited to 26 characters. The first 10 make up the first 10=
 characters of the bitcoin URI public address where to send bitcoin, and mu=
st be present. The remaining characters are any plain text such as =E2=80=
=9CThe Habit 1=E2=80=9D or =E2=80=9CStarbucks-Reg 1=E2=80=9D, more human re=
adable information. The partial address serves as a check against a nearby =
attacker who may try to lure a Sender into sending payment to a separate wa=
llet by advertising a similar Scan Response but cannot replicate a public a=
ddress with the same leading 10 characters and different trailing character=
s.</span></p></li><li dir=3D"ltr" style=3D"list-style-type:decimal;font-siz=
e:16px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;backgr=
ound-color:transparent"><p dir=3D"ltr" style=3D"line-height:1.6000000238418=
6;margin-top:0pt;margin-bottom:0pt"><span style=3D"vertical-align:baseline;=
white-space:pre-wrap;background-color:transparent">When the Central scans t=
he advertisement, it may display the Scan Response in a human readable list=
ing using the two pieces of information. If Central chooses this advertisem=
ent to receive the full request, it then subscribes to the service and writ=
es the characteristic (a second UUID) with it=E2=80=99s own name, or a blan=
k if not sending a name, to the Peripheral.</span></p></li><li dir=3D"ltr" =
style=3D"list-style-type:decimal;font-size:16px;font-family:Arial;color:rgb=
(51,51,51);vertical-align:baseline;background-color:transparent"><p dir=3D"=
ltr" style=3D"line-height:1.60000002384186;margin-top:0pt;margin-bottom:0pt=
"><span style=3D"vertical-align:baseline;white-space:pre-wrap;background-co=
lor:transparent">Peripheral gets a characteristic write request of the Cent=
ral=E2=80=99s name, and acknowledges the receipt by sending a server respon=
se.</span></p></li><li dir=3D"ltr" style=3D"list-style-type:decimal;font-si=
ze:16px;font-family:Arial;color:rgb(51,51,51);vertical-align:baseline;backg=
round-color:transparent"><p dir=3D"ltr" style=3D"line-height:1.600000023841=
86;margin-top:0pt;margin-bottom:0pt"><span style=3D"vertical-align:baseline=
;white-space:pre-wrap;background-color:transparent">Central receives a char=
acteristic write (from the response) and immediately requests the entire bi=
tcoin URI by issuing a read request on that characteristic.</span></p></li>=
<li dir=3D"ltr" style=3D"list-style-type:decimal;font-size:16px;font-family=
:Arial;color:rgb(51,51,51);vertical-align:baseline;background-color:transpa=
rent"><p dir=3D"ltr" style=3D"line-height:1.60000002384186;margin-top:0pt;m=
argin-bottom:12pt"><span style=3D"vertical-align:baseline;white-space:pre-w=
rap;background-color:transparent">Peripheral receives the read request and =
sends the entire bitcoin URI over that characteristic up to 512 bytes.</spa=
n></p></li></ol><p dir=3D"ltr" style=3D"line-height:1.60000002384186;margin=
-top:0pt;margin-bottom:12pt"><span style=3D"font-size:16px;font-family:Aria=
l;color:rgb(51,51,51);vertical-align:baseline;white-space:pre-wrap;backgrou=
nd-color:transparent">This ends the proposed specification as the bitcoin U=
RI transfer is complete. The Sender would then normally confirm the request=
 and decide whether to initiate the fund transfer.</span></p><h2 dir=3D"ltr=
" style=3D"line-height:1.225;margin-top:17pt;margin-bottom:12pt"><span styl=
e=3D"font-size:40px;font-family:Arial;color:rgb(51,51,51);vertical-align:ba=
seline;white-space:pre-wrap;background-color:transparent">Compatibility</sp=
an></h2><p dir=3D"ltr" style=3D"line-height:1.60000002384186;margin-top:0pt=
;margin-bottom:12pt"><span style=3D"font-size:16px;font-family:Arial;color:=
rgb(51,51,51);vertical-align:baseline;white-space:pre-wrap;background-color=
:transparent">There are no prior BIPs covering this.</span></p><h2 dir=3D"l=
tr" style=3D"line-height:1;margin-top:17pt;margin-bottom:12pt"><span style=
=3D"font-size:40px;font-family:Arial;color:rgb(51,51,51);vertical-align:bas=
eline;white-space:pre-wrap;background-color:transparent">Examples</span></h=
2><p dir=3D"ltr" style=3D"line-height:1.45;margin-top:0pt;margin-bottom:12p=
t"><span style=3D"font-size:16px;font-family:Arial;color:rgb(51,51,51);vert=
ical-align:baseline;white-space:pre-wrap;background-color:transparent">Airb=
itz iOS Bluetooth Low Energy to Bluetooth Low Energy request transfer.</spa=
n></p><h2 dir=3D"ltr" style=3D"line-height:1.225;margin-top:17pt;margin-bot=
tom:12pt"><span style=3D"font-size:40px;font-family:Arial;color:rgb(51,51,5=
1);vertical-align:baseline;white-space:pre-wrap;background-color:transparen=
t">References</span></h2><br><br></span></div><div><br clear=3D"all"><div><=
div class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><=
div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><br><table border=3D=
"0" style=3D"font-size:medium;font-family:Helvetica,Arial,sans-serif"><tbod=
y><tr valign=3D"top"><td style=3D"width:auto;vertical-align:top;white-space=
:nowrap"><img src=3D"https://s3.amazonaws.com/webapp.wisestamp.com/v7Zg7GfI=
Q9mF5xlHZrZA_airbitzlogo.png" alt=3D"logo" style=3D"border: none; border-ra=
dius: 4px;">=C2=A0<span style=3D"font-size:small">=C2=A0=C2=A0<br></span></=
td><td><span style=3D"font-size:small"><font color=3D"#3d85c6"><b>Paul Puey=
</b></font><font color=3D"#808080">=C2=A0</font><span style=3D"color:rgb(13=
6,136,136)">CEO / Co-Founder</span><span style=3D"color:rgb(136,136,136)">,=
 Airbitz Inc</span></span><br><div style=3D"margin-top:0px;margin-bottom:0p=
x"><span style=3D"font-size:small"><span style=3D"color:rgb(128,128,128)"><=
a style=3D"color:rgb(128,128,128);outline:none;text-decoration:none">+1-6</=
a>19-850-8624=C2=A0</span></span><span style=3D"font-size:small"><span styl=
e=3D"color:rgb(69,102,142)">|=C2=A0</span><a href=3D"http://airbitz.co/" st=
yle=3D"color:rgb(128,128,128);outline:none" target=3D"_blank">http://airbit=
z.co</a></span><span style=3D"font-size:small;color:rgb(128,128,128)">=C2=
=A0</span><span style=3D"font-size:small;color:rgb(128,128,128)"><span styl=
e=3D"color:rgb(69,102,142)">|=C2=A0</span>San Diego</span></div><div style=
=3D"margin-top:5px"><a href=3D"http://facebook.com/airbitz" style=3D"color:=
rgb(17,85,204);outline:none" target=3D"_blank"><img src=3D"http://images.wi=
sestamp.com/facebook.png" width=3D"16" style=3D"border: none;"></a>=C2=A0<a=
 href=3D"http://twitter.com/airbitz" style=3D"color:rgb(17,85,204);outline:=
none" target=3D"_blank"><img src=3D"http://images.wisestamp.com/twitter.png=
" width=3D"16" alt=3D"" style=3D"border: none;"></a>=C2=A0<a href=3D"https:=
//plus.google.com/118173667510609425617" style=3D"color:rgb(17,85,204);outl=
ine:none" target=3D"_blank"><img src=3D"http://images.wisestamp.com/googlep=
lus.png" width=3D"16" style=3D"border: none;"></a>=C2=A0<a href=3D"https://=
go.airbitz.co/comments/feed/" style=3D"color:rgb(17,85,204);outline:none" t=
arget=3D"_blank"><img src=3D"http://images.wisestamp.com/blogRSS.png" width=
=3D"16" style=3D"border: none;"></a>=C2=A0<a href=3D"http://linkedin.com/in=
/paulpuey" style=3D"color:rgb(17,85,204);outline:none" target=3D"_blank"><i=
mg src=3D"http://images.wisestamp.com/linkedin.png" width=3D"16" style=3D"b=
order: none;" alt=3D""></a>=C2=A0<a href=3D"https://angel.co/paul-puey" sty=
le=3D"color:rgb(17,85,204);outline:none" target=3D"_blank"><img src=3D"http=
://images.wisestamp.com/angelList.png" width=3D"16" style=3D"border: none;"=
 alt=3D""></a></div></td></tr></tbody></table><div style=3D"font-size:14px;=
margin-bottom:4px;font-family:Helvetica,Arial,sans-serif;font-weight:bold">=
<b style=3D"font-size:x-small;font-family:arial,sans-serif">DOWNLOAD THE AI=
RBITZ WALLET:</b><br></div><span style=3D"font-size:medium;font-family:Helv=
etica,Arial,sans-serif"><a href=3D"https://play.google.com/store/apps/detai=
ls?id=3Dcom.airbitz" style=3D"color:rgb(17,85,204);outline:none;text-decora=
tion:none" target=3D"_blank"><img src=3D"http://images.wisestamp.com.s3.ama=
zonaws.com/apps/mobile_android.png" style=3D"border: none;">=C2=A0</a></spa=
n><span style=3D"font-size:medium;font-family:Helvetica,Arial,sans-serif"><=
/span><span style=3D"font-size:medium;font-family:Helvetica,Arial,sans-seri=
f"><a href=3D"https://itunes.apple.com/us/app/airbitz/id843536046" style=3D=
"color:rgb(17,85,204);outline:none;text-decoration:none" target=3D"_blank">=
<img src=3D"http://images.wisestamp.com.s3.amazonaws.com/apps/mobile_iphone=
.png" style=3D"border: none;"></a></span><br></div><div dir=3D"ltr"><br></d=
iv><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><br></div></div><div =
dir=3D"ltr"><br></div></div></div></div></div></div></div></div></div></div=
></div>
</div></div></div>

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