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From: Christopher Allen <ChristopherA@lifewithalacrity.com>
Date: Fri, 11 Aug 2023 18:05:06 -0700
Message-ID: <CACrqygAPKUUYxWbV0XwrRN9U1sNEGCkv+iWwA8MiLLjN_+dASQ@mail.gmail.com>
To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>, 
 symphonicbtc <symphonicbtc@proton.me>
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Subject: Re: [bitcoin-dev] BIP for Serverless Payjoin (AdamISZ)
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On Fri, Aug 11, 2023 at 3:29 PM symphonicbtc via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Quick little nit I noticed as well, are you sure base64 encoding is the
> best choice for the psk in the URI? You may find that having to urlencode
> the special characters in base64 it impacts readability and adds a layer =
of
> complexity if a human wanted to extract the psk from the URI for some
> reason. I suggest using something like [base64url](
> https://datatracker.ietf.org/doc/html/rfc4648#section-5) which modifies
> base64 slightly to be more suited to this purpose.


Yes, the URI version of base64 is better.

>
However, If you plan to display these via QRs, either will double the
density of the QR as QR libraries treat them as binary data (like hex of
hex data). Thus you may want to use UR encoding, which is what over a dozen
bitcoin wallets use to encode PSBTs. URs are very efficient with QRs, and
have the optional benefit that if the data carried becomes too large, they
can be animated. The have other advantages.

* A top level link about URs:
https://github.com/BlockchainCommons/crypto-commons/blob/master/Docs/README=
.md#uniform-resources-urs

* About the base64 encoding with QRs problem:
https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-0=
03-uri-binary-compatibility.md

* The base UR tech spec:
https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-0=
05-ur.md

* List of bitcoin wallets using UR for PSBTs:
https://github.com/blockchaincommons/gordian-developer-community#urs

* List of UR libraries:
https://github.com/BlockchainCommons/crypto-commons#bc-ur

Let me know if you=E2=80=99re interested.

=E2=80=94 Christopher Allen

>

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<div><div><br></div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cl=
ass=3D"gmail_attr">On Fri, Aug 11, 2023 at 3:29 PM symphonicbtc via bitcoin=
-dev &lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D=
"_blank">bitcoin-dev@lists.linuxfoundation.org</a>&gt; wrote:</div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-wid=
th:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,2=
04,204)" dir=3D"auto">Quick little nit I noticed as well, are you sure base=
64 encoding is the best choice for the psk in the URI? You may find that ha=
ving to urlencode the special characters in base64 it impacts readability a=
nd adds a layer of complexity if a human wanted to extract the psk from the=
 URI for some reason. I suggest using something like [base64url](<a href=3D=
"https://datatracker.ietf.org/doc/html/rfc4648#section-5" rel=3D"noreferrer=
" target=3D"_blank">https://datatracker.ietf.org/doc/html/rfc4648#section-5=
</a>) which modifies base64 slightly to be more suited to this purpose.</bl=
ockquote><div dir=3D"auto"><br></div><div dir=3D"auto">Yes, the URI version=
 of base64 is better.</div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-l=
eft:1ex;border-left-color:rgb(204,204,204)" dir=3D"auto"></blockquote><div =
dir=3D"auto"><br></div><div dir=3D"auto">However, If you plan to display th=
ese via QRs, either will double the density of the QR as QR libraries treat=
 them as binary data (like hex of hex data). Thus you may want to use UR en=
coding, which is what over a dozen bitcoin wallets use to encode PSBTs. URs=
 are very efficient with QRs, and have the optional benefit that if the dat=
a carried becomes too large, they can be animated. The have other advantage=
s.=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">* A top level l=
ink about URs:=C2=A0<div><a href=3D"https://github.com/BlockchainCommons/cr=
ypto-commons/blob/master/Docs/README.md#uniform-resources-urs">https://gith=
ub.com/BlockchainCommons/crypto-commons/blob/master/Docs/README.md#uniform-=
resources-urs</a></div><div dir=3D"auto"><br></div><div dir=3D"auto">* Abou=
t the base64 encoding with QRs problem:=C2=A0<div><a href=3D"https://github=
.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-003-uri-binary-=
compatibility.md">https://github.com/BlockchainCommons/Research/blob/master=
/papers/bcr-2020-003-uri-binary-compatibility.md</a></div><div dir=3D"auto"=
><br></div><div dir=3D"auto">* The base UR tech spec:=C2=A0<div><a href=3D"=
https://github.com/BlockchainCommons/Research/blob/master/papers/bcr-2020-0=
05-ur.md">https://github.com/BlockchainCommons/Research/blob/master/papers/=
bcr-2020-005-ur.md</a></div><div dir=3D"auto"><br></div><div dir=3D"auto">*=
 List of bitcoin wallets using UR for PSBTs:=C2=A0<div><a href=3D"https://g=
ithub.com/blockchaincommons/gordian-developer-community#urs">https://github=
.com/blockchaincommons/gordian-developer-community#urs</a></div><div dir=3D=
"auto"><br></div><div dir=3D"auto">* List of UR libraries:=C2=A0<div><a hre=
f=3D"https://github.com/BlockchainCommons/crypto-commons#bc-ur">https://git=
hub.com/BlockchainCommons/crypto-commons#bc-ur</a></div><div dir=3D"auto"><=
br></div><div dir=3D"auto">Let me know if you=E2=80=99re interested.</div><=
div dir=3D"auto"><br></div><div dir=3D"auto">=E2=80=94 Christopher Allen</d=
iv></div></div></div></div></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;pad=
ding-left:1ex;border-left-color:rgb(204,204,204)" dir=3D"auto"></blockquote=
></div></div>
</div>

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