Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1X1xjm-0007yw-4p for bitcoin-development@lists.sourceforge.net; Tue, 01 Jul 2014 13:04:42 +0000 Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.220.175 as permitted sender) client-ip=209.85.220.175; envelope-from=alexy.kot.all@gmail.com; helo=mail-vc0-f175.google.com; Received: from mail-vc0-f175.google.com ([209.85.220.175]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1X1xjk-0003C9-7f for bitcoin-development@lists.sourceforge.net; Tue, 01 Jul 2014 13:04:42 +0000 Received: by mail-vc0-f175.google.com with SMTP id hy4so8864339vcb.6 for ; Tue, 01 Jul 2014 06:04:32 -0700 (PDT) X-Received: by 10.52.24.68 with SMTP id s4mr1047033vdf.37.1404219872526; Tue, 01 Jul 2014 06:04:32 -0700 (PDT) MIME-Version: 1.0 Sender: alexy.kot.all@gmail.com Received: by 10.58.237.129 with HTTP; Tue, 1 Jul 2014 06:03:52 -0700 (PDT) In-Reply-To: References: <20140320215208.GC88006@giles.gnomon.org.uk> <20140326224826.GE62995@giles.gnomon.org.uk> From: Alex Kotenko Date: Tue, 1 Jul 2014 14:03:52 +0100 X-Google-Sender-Auth: uJUtZWDC-7Yu4dLmOMnUYPvj6Z8 Message-ID: Cc: Bitcoin Dev Content-Type: multipart/alternative; boundary=20cf3071cfdeb0475d04fd216a0d X-Spam-Score: 0.6 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (alexy.kot.all[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 1.2 MISSING_HEADERS Missing To: header 1.0 HTML_MESSAGE BODY: HTML included in message -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-Headers-End: 1X1xjk-0003C9-7f Subject: Re: [Bitcoin-development] Payment Protocol for Face-to-face Payments X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Jul 2014 13:04:42 -0000 --20cf3071cfdeb0475d04fd216a0d Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable In my mind it's not like the client's phone is going all directions at the same time. There should be a priority method and fallback method(s). =E2=80= =8BAnd I =E2=80=8Bsee p2p radio as priority, and web as fallback, and BIP21 in the e= nd as always-working-default. =E2=80=8BSo I'm keeping support for it all while want to be able to provide= best user experience. Mike, a while ago in =E2=80=8Bthis thread you've described contactless card= s user experience. I'm also using contactless cards often, and what I'm aiming at is creating same level of user experience for Bitcoin users. Encryption over bluetooth is a matter to worry about, and we will introduce that, but we need to sort out more low level problems first before coming into that stage. So, the backwards compatibility is a good issue Michael pointed out. While processing of multiple "r" parameters is indeed uncertain (since there is no RFC for that various implementations may behave differently), the array solution is somewhat better. The array parameter name is " r%5B1%5D=3D", i.e. it's not "r=3D", and we can add plain "r=3D" alongside. = And if particular implementation understands the array construct - it will use it, otherwise it will ignore the "r%5B1%5D=3D" and use only usual "r=3D". This doens't work though for cases where particular implementation understands array construct but doesn't work well with repeating parameters, since it will see two repeating "r" - an array and a string. I don't have a solution for that atm. If add completely new parameter to solve this we will need to make it an array straight away to address upcoming issues with accommodating other protocols. And then I would also modify existing BIP72 to strictly define "r=3D" as "http(s)" =E2=80=8Bonly =E2=80=8Bparameter, while all other protocols (blue= tooth, WiFi Direct, ultrasound, chirp etc) should go to the new array parameter. =E2=80=8B --20cf3071cfdeb0475d04fd216a0d Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
In my mind it's not like the= client's phone is going all directions at the same time. There should = be a priority method and fallback method(s). =E2=80=8BAnd I =E2=80=8Bsee p2= p radio as priority, and web as fallback, and BIP21 in the end as always-wo= rking-default.

=E2=80=8BSo I'm keeping support for it all while w= ant to be able to provide best user experience.=C2=A0
Mike, a while ago in =E2=80=8Bthis thread you'= ;ve described contactless cards user experience. I'm also using contact= less cards often, and what I'm aiming at is creating same level of user= experience for Bitcoin users.=C2=A0

Encryption ov= er bluetooth is a matter to worry about, and we will introduce that, but we= need to sort out more low level problems first before coming into that sta= ge.=C2=A0


So, the backwards compatibility is a good issue Michael pointed out.=C2=A0<= br>
While processing of multiple "r&quo= t; parameters is indeed uncertain (since there is no RFC for that various i= mplementations may behave differently), the array solution is somewhat bett= er. The array parameter name is "r%5B1%= 5D=3D", i.e. it's not "r=3D", and we can add plai= n "r=3D" alongside. And if particular implementation understands = the array construct - it will use it, otherwise it will ignore the "r%5B1%5D=3D" and use only usual &q= uot;r=3D".=C2=A0

This doens&#= 39;t work though for cases where particular implementation understands arra= y construct but doesn't work well with repeating parameters, since it w= ill see two repeating "r" - an array and a string. I don't ha= ve a solution for that atm.=C2=A0


<= div class=3D"gmail_default" style=3D"font-family:'courier new',mono= space;color:rgb(0,51,0)">If add completely new parameter to solve this we w= ill need to make it an array straight away to address upcoming issues with = accommodating other protocols.=C2=A0
And then I would also modify existing BIP72 to st= rictly define "r=3D" as "http(s)" =E2=80=8Bonly =E2=80= =8Bparameter, while all other protocols (bluetooth, WiFi Direct, ultrasound= , chirp etc) should go to the new array parameter.


<= span style=3D"color:rgb(0,51,0);font-family:'courier new',monospace= ">=E2=80=8B
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