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From: Matt David <matt@netki.com>
In-Reply-To: <CAH+Axy7OtGgbtmz+grfuob419PwQJiYfZsQnMEs=_McZFBqu2A@mail.gmail.com>
Date: Tue, 21 Jun 2016 14:17:12 -0700
Message-Id: <66AA3F7D-05BF-4435-A3B3-4DF136B212DF@netki.com>
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	<CAH+Axy7OtGgbtmz+grfuob419PwQJiYfZsQnMEs=_McZFBqu2A@mail.gmail.com>
To: James MacWhyte <macwhyte@gmail.com>,
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] Even more proposed BIP extensions to BIP 0070
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Hey all,

Interestingly enough, the original BIP75 idea started by trying to move =
the Payment Protocol to use JSON, but because of all of the reasons =
mentioned by Andreas, we ended up with protobuf. There is quite a bit of =
language support on both desktop and mobile platforms so that's become =
mostly a non-issue.

Regarding the lack of optional client-supplied identification, BIP75 was =
designed to solve this issue. It allows both parties in a transaction to =
share identity information in an out-of-band fashion in order to keep =
specific identity information off-chain.

With regards to extensibility of PKI usage, both BIP70 and BIP75 provide =
plenty of flexibility. Both the InvoiceRequest and PaymentRequest =
contain the pki_type and pki_data fields to allow for the use of non =
X.509 certificates. Currently, the only pki_types specified in both BIPs =
are none or x509_sha256, but there isn't any specific limit on what can =
be used as long as you can define a PKI type to be used, include a =
public key and a signature that proves control of the keypair. Perhaps a =
new BIP allowing for additional PKI types can be submitted, similar to =
how RFCs extend usage of ciphers for TLS (ie., RFC 5932).

Regarding subscriptions, and as proposed in the address book example use =
case in BIP75, a wallet can be setup to automatically create BIP75 =
transactions in order to retrieve a wallet address to pay for a =
subscription on whatever frequency you would like to use. The service =
provider can approve the first BIP75 transaction and then store the =
public key for that client for future use. For subsequent subscription =
payments, the service provider may automatically return wallet addresses =
for each BIP75 transaction, understanding that the subsequent BIP75 =
transactions are linked to the public key that was used for the first =
transaction and therefore the subscription has been paid for. =
Additionally, the BIP75 InvoiceRequest message contains a memo field =
that can be used to include any additional subscription information =
required by the subscription provider (and can be different for both =
first and subsequent BIP75 transactions).

This is a very interesting idea and I'd love to see how the community =
can work together to make Bitcoin more user and mainstream friendly =
while increasing security for all parties involved. All movement toward =
this is really the goal at Netki.

Best,

Matt David
Sr. Software Engineer
Netki, Inc.

matt@netki.com



> On Jun 21, 2016, at 1:56 PM, James MacWhyte via bitcoin-dev =
<bitcoin-dev@lists.linuxfoundation.org> wrote:
>=20
> Thanks for starting this discussion, Erik.
>=20
>=20
> Should this be a new BIP?  I know netki's BIP75 is out there - but I =
think it's too specific and too reliant on the domain name system.
>=20
> This is not quite accurate. BIP75 is designed to be independent of any =
name resolution system. You could use it with a static URL that you =
share, for example, or even use it to implement a mesh-network payment =
system over bluetooth. Netki's wallet names do use DNS, but that isn't =
related to this discussion.
>=20
> What BIP75 *does* do is provide a way for a client to get a new =
payment address for every payment. I personally think it is better than =
BIP47 for the uses you mentioned (subscriptions, etc).
>=20
> I'm glad you brought up identity methods other than x509. At =
breadwallet we are thinking about how to establish the most universal =
system, and letting users identify themselves with any of a selection of =
identity systems is ideal. I think the pki_data slot should be =
constantly expanded to allow new identity types, but they should be =
explained/standardized in the BIPs that add them and use universal =
names. "netki://" wouldn't be appropriate, for example, if their method =
is open sourced and possibly used by others--it should instead be given =
a product name like "dnswallet://" or something more clever.
>=20
> James
>=20
>=20
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"margin: 0px; line-height: normal;" class=3D"">Hey=
 all,</div><div style=3D"margin: 0px; line-height: normal; min-height: =
14px;" class=3D""><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal;" class=3D"">Interestingly enough, the original =
BIP75 idea started by trying to move the Payment Protocol to use JSON, =
but because of all of the reasons mentioned by Andreas, we ended up with =
protobuf. There is quite a bit of language support on both desktop and =
mobile platforms so that's become mostly a non-issue.</div><div =
style=3D"margin: 0px; line-height: normal; min-height: 14px;" =
class=3D""><br class=3D""></div><div style=3D"margin: 0px; line-height: =
normal;" class=3D"">Regarding the lack of optional client-supplied =
identification, BIP75 was designed to solve this issue. It allows both =
parties in a transaction to share identity information in an out-of-band =
fashion in order to keep specific identity information =
off-chain.</div><div style=3D"margin: 0px; line-height: normal; =
min-height: 14px;" class=3D""><br class=3D""></div><div style=3D"margin: =
0px; line-height: normal;" class=3D"">With regards to extensibility of =
PKI usage, both BIP70 and BIP75 provide plenty of flexibility. Both the =
InvoiceRequest and PaymentRequest contain the pki_type and pki_data =
fields to allow for the use of non X.509 certificates. Currently, the =
only pki_types specified in both BIPs are none or x509_sha256, but there =
isn't any specific limit on what can be used as long as you can define a =
PKI type to be used, include a public key and a signature that proves =
control of the keypair. Perhaps a new BIP allowing for additional PKI =
types can be submitted, similar to how RFCs extend usage of ciphers for =
TLS (ie., RFC 5932).</div><div style=3D"margin: 0px; line-height: =
normal; min-height: 14px;" class=3D""><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal;" class=3D"">Regarding =
subscriptions, and as proposed in the address book example use case in =
BIP75, a wallet can be setup to automatically create BIP75 transactions =
in order to retrieve a wallet address to pay for a subscription on =
whatever frequency you would like to use. The service provider can =
approve the first BIP75 transaction and then store the public key for =
that client for future use. For subsequent subscription payments, the =
service provider may automatically return wallet addresses for each =
BIP75 transaction, understanding that the subsequent BIP75 transactions =
are linked to the public key that was used for the first transaction and =
therefore the subscription has been paid for. Additionally, the BIP75 =
InvoiceRequest message contains a memo field that can be used to include =
any additional subscription information required by the subscription =
provider (and can be different for both first and subsequent BIP75 =
transactions).</div><div style=3D"margin: 0px; line-height: normal; =
min-height: 14px;" class=3D""><br class=3D""></div><div style=3D"margin: =
0px; line-height: normal;" class=3D"">This is a very interesting idea =
and I'd love to see how the community can work together to make Bitcoin =
more user and mainstream friendly while increasing security for all =
parties involved. All movement toward this is really the goal at =
Netki.</div><div class=3D"">
<div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><br class=3D"Apple-interchange-newline"><font face=3D"Futura" =
class=3D"">Best,</font></div><div style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: auto; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; widows: auto; word-spacing: =
0px; -webkit-text-stroke-width: 0px;" class=3D""><font face=3D"Futura" =
class=3D""><br class=3D""></font></div><div style=3D"color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: auto; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; widows: auto; word-spacing: =
0px; -webkit-text-stroke-width: 0px;" class=3D""><font face=3D"Futura" =
color=3D"#0795b1" class=3D"">Matt David</font></div><div style=3D"color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: auto; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; widows: =
auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><font=
 face=3D"Futura" color=3D"#0795b1" class=3D"">Sr. Software =
Engineer</font></div><div style=3D"color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><font face=3D"Futura" =
color=3D"#0795b1" class=3D"">Netki, Inc.</font></div><div style=3D"color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: auto; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; widows: =
auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><font=
 face=3D"Futura" color=3D"#0795b1" class=3D""><br =
class=3D""></font></div><div style=3D"color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><font face=3D"Futura" =
color=3D"#0795b1" class=3D""><a href=3D"mailto:matt@netki.com" =
class=3D"">matt@netki.com</a></font></div><br =
class=3D"Apple-interchange-newline" style=3D"color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
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0); font-family: Helvetica; font-size: 12px; font-style: normal; =
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0px; -webkit-text-stroke-width: 0px;"><span><span><img height=3D"62" =
width=3D"250" apple-inline=3D"yes" =
id=3D"5BEE6279-905D-4869-AD2F-0FA8B22FAF12" apple-width=3D"yes" =
apple-height=3D"yes" =
src=3D"cid:04619845-580A-4EF6-A4F9-9789F60E12C7@gid.net" =
class=3D""></span>
</span></span></div>
<br class=3D""><div style=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jun 21, 2016, at 1:56 PM, James MacWhyte via bitcoin-dev =
&lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" =
class=3D"">bitcoin-dev@lists.linuxfoundation.org</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D"">Thanks for starting this discussion, Erik.<br class=3D""><br =
class=3D""><div class=3D""><div class=3D"gmail_quote"><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div dir=3D"ltr" class=3D""><div class=3D""><br =
class=3D""></div><div class=3D"">Should this be a new BIP?&nbsp; I know =
netki's BIP75 is out there - but I think it's too specific and too =
reliant on the domain name system.<br =
class=3D""></div></div></blockquote><div class=3D"">&nbsp;</div><div =
class=3D""><font color=3D"#212121" face=3D"helvetica neue, helvetica, =
arial, sans-serif" class=3D"">This is not quite accurate. BIP75 is =
designed to be independent of any name resolution system. You could use =
it with a static URL that you share, for example, or even use it to =
implement a mesh-network payment system over bluetooth. Netki's wallet =
names do use DNS, but that isn't related to this =
discussion.</font></div><div class=3D""><font color=3D"#212121" =
face=3D"helvetica neue, helvetica, arial, sans-serif" class=3D""><br =
class=3D""></font></div><div class=3D""><font color=3D"#212121" =
face=3D"helvetica neue, helvetica, arial, sans-serif" class=3D"">What =
BIP75 *does* do is provide a way for a client to get a new payment =
address for every payment. I personally think it is better than BIP47 =
for the uses you mentioned (subscriptions, etc).</font></div><br =
class=3D"inbox-inbox-Apple-interchange-newline"><div class=3D"">I'm glad =
you brought up identity methods other than x509. At breadwallet we are =
thinking about how to establish the most universal system, and letting =
users identify themselves with any of a selection of identity systems is =
ideal. I think the pki_data slot should be constantly expanded to allow =
new identity types, but they should be explained/standardized in the =
BIPs that add them and use universal names. "<span =
style=3D"line-height:1.5" class=3D"">netki://" wouldn't be appropriate, =
for example, if their method is open sourced and possibly used by =
others--it should instead be given a product name like "dnswallet://" or =
something more clever.<br class=3D""><br class=3D"">James<br =
class=3D""><br class=3D""><br class=3D""></span></div></div></div></div>
_______________________________________________<br class=3D"">bitcoin-dev =
mailing list<br class=3D""><a =
href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" =
class=3D"">bitcoin-dev@lists.linuxfoundation.org</a><br =
class=3D"">https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev<=
br class=3D""></div></blockquote></div><br class=3D""></body></html>=

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