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Date: Mon, 28 Feb 2022 15:56:11 +0100 (CET)
From: Prayank <prayank@tutanota.de>
To: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
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Subject: [bitcoin-dev] Decentralized BIP 47 payment code directory
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Hello World,
There was some discussion about BIP 47 on twitter recently: https://twitter.com/BitcoinQ_A/status/1356177927285714946
BIP 47 improves privacy however there are a few reasons why its less used:
1.Some developers consider it spams Bitcoin without improving anything: https://twitter.com/LukeDashjr/status/1280475865827151878
2.Paynym (a centralized directory managed by Samourai) and Samourai wallet is the only implementation used for BIP 47 right now. Centralized payment code directory isn't good for privacy and security.
There can be few other important issues which I missed in this email. I have few ideas to solve these 2 problems with the use of TXT records and domains. Since buying domain, managing DNS etc. is mostly centralized I won't share the example using normal DNS. Below proof of concept uses GNS (GNU Name Service):
```
Payment code for Alice: PM8TJggVVXFKAmfkjnA1CQcrSbGScUKRsVohpfMpSM56f6jg5uQTPJvNS1wKDGV17d9NWLqoVzsJ8qURqpUECmSFLcUuC4g3aMtoXp2fChY1ZEqzG16f
Start GNUnet:
gnunet-arm -s
Create identity:
gnunet-identity -C alice
Check public key:
gnunet-identity -d
alice - 000G005XCTRJ0DJGPVPNY66GAY52C61KA8A7CA92PKT51PHNVWY9JF8WB4 - ECDSA
Add payment code as TXT record which expires in 90 days:
gnunet-namestore -z alice -a -e "90 d" -p -t TXT -n pay -V "PM8TJTLJbPRGxSbc8EJi42Wrr6QbNSaSSVJ5Y3E4pbCYiTHUskHg13935Ubb7q8tx9GVbh2UuRnBc3WSyJHhUrw8KhprKnn9eDznYGieTzFcwQRya4GA"
Check payment code:
gnunet-gns -t TXT -u pay.alice
pay.alice:
Got `TXT' record: PM8TJTLJbPRGxSbc8EJi42Wrr6QbNSaSSVJ5Y3E4pbCYiTHUskHg13935Ubb7q8tx9GVbh2UuRnBc3WSyJHhUrw8KhprKnn9eDznYGieTzFcwQRya4GA
```
Similarly notification transaction can be replaced with `gnunet-publish`. Nostr is still a work in progress and I think it could also be used for such things in future. Everything looks achievable and involves basic things but we still see people posting their bitcoin address on social media to get donations.
Related:
Q&A: https://bitcoin.stackexchange.com/questions/106971/how-to-accept-donation-correctly/
New proposal: https://gist.github.com/Kixunil/0ddb3a9cdec33342b97431e438252c0a
--
Prayank
A3B1 E430 2298 178F
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<div>Hello World,<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">Th=
ere was some discussion about BIP 47 on twitter recently: https://twitter.c=
om/BitcoinQ_A/status/1356177927285714946</div><div><br></div><div dir=3D"au=
to">BIP 47 improves privacy however there are a few reasons why its less us=
ed:<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">1.Some developer=
s consider it spams Bitcoin without improving anything: https://twitter.com=
/LukeDashjr/status/1280475865827151878<br></div><div dir=3D"auto"><br></div=
><div dir=3D"auto">2.Paynym (a centralized directory managed by Samourai) a=
nd Samourai wallet is the only implementation used for BIP 47 right now. Ce=
ntralized payment code directory isn't good for privacy and security.<br></=
div><div dir=3D"auto"><br></div><div dir=3D"auto">There can be few other im=
portant issues which I missed in this email. I have few ideas to solve thes=
e 2 problems with the use of TXT records and domains. Since buying domain, =
managing DNS etc. is mostly centralized I won't share the example using nor=
mal DNS. Below proof of concept uses GNS (GNU Name Service):<br></div><div =
dir=3D"auto"><br></div><div dir=3D"auto">```<br></div><div dir=3D"auto"><br=
></div><div dir=3D"auto">Payment code for Alice: PM8TJggVVXFKAmfkjnA1CQcrSb=
GScUKRsVohpfMpSM56f6jg5uQTPJvNS1wKDGV17d9NWLqoVzsJ8qURqpUECmSFLcUuC4g3aMtoX=
p2fChY1ZEqzG16f<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">Star=
t GNUnet: <br></div><div dir=3D"auto"><br></div><div dir=3D"auto">gnunet-ar=
m -s<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">Create identity=
:<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">gnunet-identity -C=
alice<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">Check public =
key:<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">gnunet-identity=
-d<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">alice - 000G005X=
CTRJ0DJGPVPNY66GAY52C61KA8A7CA92PKT51PHNVWY9JF8WB4 - ECDSA<br></div><div di=
r=3D"auto"><br></div><div dir=3D"auto">Add payment code as TXT record which=
expires in 90 days:<br></div><div dir=3D"auto"><br></div><div dir=3D"auto"=
>gnunet-namestore -z alice -a -e "90 d" -p -t TXT -n pay -V "PM8TJTLJbPRGxS=
bc8EJi42Wrr6QbNSaSSVJ5Y3E4pbCYiTHUskHg13935Ubb7q8tx9GVbh2UuRnBc3WSyJHhUrw8K=
hprKnn9eDznYGieTzFcwQRya4GA"<br></div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Check payment code:<br></div><div dir=3D"auto"><br></div><div dir=
=3D"auto">gnunet-gns -t TXT -u pay.alice<br></div><div dir=3D"auto"><br></d=
iv><div dir=3D"auto">pay.alice:<br></div><div dir=3D"auto">Got `TXT' record=
: PM8TJTLJbPRGxSbc8EJi42Wrr6QbNSaSSVJ5Y3E4pbCYiTHUskHg13935Ubb7q8tx9GVbh2Uu=
RnBc3WSyJHhUrw8KhprKnn9eDznYGieTzFcwQRya4GA<br></div><div dir=3D"auto"><br>=
</div><div dir=3D"auto">```<br></div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Similarly notification transaction can be replaced with `gnunet-p=
ublish`. Nostr is still a work in progress and I think it could also be use=
d for such things in future. Everything looks achievable and involves basic=
things but we still see people posting their bitcoin address on social med=
ia to get donations.<br></div><div dir=3D"auto"><br></div><div dir=3D"auto"=
>Related:<br></div><div dir=3D"auto"><br></div><div dir=3D"auto">Q&A: h=
ttps://bitcoin.stackexchange.com/questions/106971/how-to-accept-donation-co=
rrectly/<br></div><div dir=3D"auto">New proposal: https://gist.github.com/K=
ixunil/0ddb3a9cdec33342b97431e438252c0a<br></div><div><br></div><div dir=3D=
"auto"><br></div><div dir=3D"auto">-- <br></div><div>Prayank<br></div><div>=
<br></div><div dir=3D"auto">A3B1 E430 2298 178F<br></div> </body>
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