Date: Sat, 20 Aug 2022 12:04:11 +0200
From: Max Hillebrand <max@towardsliberty.com>
To: alicexbt <alicexbt@protonmail.com>,
 Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>,
 alicexbt via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] joinstr: coinjoin implementation using	nostr
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Great to see an implementation of the idea=2E

Maybe I misunderstand, but isn't there a vulnerability of denial of servic=
e here?

A user who registers one input will receive the round secret identifier, a=
nd this is all the information required for output registration=2E However,=
 that malicious user can now register multiple outputs, providing the same =
secret, and nobody can link the malicious outputs to any specific input=2E =
Therefor there cannot be a blame round where the malicious input is removed=
, and thus there can be a ongoing free denial of service attack without att=
ribution or defense=2E

Skol
Max

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<html><head></head><body>Great to see an implementation of the idea=2E<br><=
br>Maybe I misunderstand, but isn't there a vulnerability of denial of serv=
ice here?<br><br>A user who registers one input will receive the round secr=
et identifier, and this is all the information required for output registra=
tion=2E However, that malicious user can now register multiple outputs, pro=
viding the same secret, and nobody can link the malicious outputs to any sp=
ecific input=2E Therefor there cannot be a blame round where the malicious =
input is removed, and thus there can be a ongoing free denial of service at=
tack without attribution or defense=2E<br><br>Skol<br>Max<br><br><br><div c=
lass=3D"gmail_quote">On August 20, 2022 10:20:00 AM GMT+02:00, alicexbt via=
 bitcoin-dev &lt;bitcoin-dev@lists=2Elinuxfoundation=2Eorg&gt; wrote:<block=
quote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0=2E8ex; border-le=
ft: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre dir=3D"auto" class=3D"k9mail">Hi Bitcoin Developers,<br><br>I have wr=
itten a python script as proof of concept for the [coinjoin implementation]=
[1] using [nostr][2]=2E I used a lot of Python scripts created by others in=
 school, so it feels nice to offer something that could be useful to others=
=2E<br><br>The implementation uses Bitcoin Core wallet and RPCs: `listunspe=
nt`, `getnewaddress`, `scantxoutset`, `createpsbt`, `combinepsbt`, `finaliz=
epsbt` and `sendrawtransaction`=2E It requires python-nostr library because=
 nostr is used for coordination between peers=2E Nostr is a decentralized n=
etwork based on cryptographic keypairs=2E It is not peer-to-peer however si=
mple and scalable=2E<br><br>Every step is published as an event using a nos=
tr relay and 5 peers coordinate to create, sign and broadcast a coinjoin tr=
ansaction=2E  I need to write a NIP that would be an alternative to blind s=
ignatures=2E Relay will share a random secret with clients for one round wh=
ich should be present in output registration request although never gets pu=
blished=2E If someone tries to register an output without registering any i=
nputs, request would not have the number initially shared with inputs so re=
quest would get rejected or published as unverified=2E Relay would not be a=
ble to link inputs and outputs as the number is same for all inputs in a ro=
und and they get registered at different times with new keys and IP address=
=2E Clients can use multiple relays at the same time to avoid trusting one =
relay=2E This would result in different shared secret number but same proce=
ss=2E If a relay tries to cheat, users will not sign the transaction and av=
oid using it in future=2E<br><br>Usage:<br><br> 1)Run `python coinjoin=2Epy=
` and enter descriptor for one of the inputs=2E<br> 2)Script will check inp=
uts for this round in every 30 seconds and register a new adddress for outp=
ut once 5 inputs are registered=2E<br> 3)Similar check happens every 30 sec=
onds for outputs=2E Last peer should create a PSBT=2E<br> 4)Unsigned PSBT w=
ill be printed and signed by wallet with `walletprocesspsbt` RPC=2E<br> 5)S=
cript will check signed PSBTs and last peer to sign should finalize coinjoi=
n transaction once 5 signed PSBTs are received=2E<br> 6)Coinjoin transactio=
n will be broadcasted and txid will printed=2E<br><br>Example:<br><br>```<b=
r>List of utxos in wallet:<br><br>wpkh([53830dca/84'/1'/0'/0/0]02449be5fb74=
725255eeeb50eba930fa87705f21e99d13cd710cf2c1f21153c808)#x2hyyeg5<br><br>Ent=
er descriptor for the input registration: wpkh([53830dca/84'/1'/0'/0/0]0244=
9be5fb74725255eeeb50eba930fa87705f21e99d13cd710cf2c1f21153c808)#x2hyyeg5<br=
><br>event id:  bcbbe62d75d99fed73f1e50ac58a38d1840b658951893e63c0322b378d7=
d56f0<br><br>```<br>```<br>tb1qhxrp4zl54ul0twtyz0gury5399q7z0kvqqrl6m regis=
tered for output<br><br>event id: 9449c9065bef356d21507a98f88b028b17fc1c49e=
b195c8d4420604fcaaef041<br>```<br>```<br>Unsigned PSBT: cHNidP8BAP1yAQIAAAA=
FtMaoJYcXvOG5L3Yaz3YyS7gIt4h5/zzOrRRS3hrVvwoAAAAAAP////+o83geaSm4L76KToIUl5=
MiZqLAUbIDJLq6DWrjP/3b8AEAAAAA/////zEF3CXIvVHpIa7No1s1yg+KtyOfXTRSyWnOdXMfz=
cDwAQAAAAD/////wMa4XAgnU+39Ien+KG9rYtv8bLMNYakmZyY/QFfwLRcAAAAAAP/////5M42I=
D6uLmQTb2tnFHnN7UMpnDD25uN8ZX7A+GNSM3QEAAAAA/////wV4xwEAAAAAABYAFLmGGov0rz7=
1uWQT0cGSkSlB4T7MeMcBAAAAAAAWABSc0/FM6Hdbdxh10IJkYOklVFWqjnjHAQAAAAAAFgAUPS=
ZKe/w6PT6qIF+WhL4wHaFymjd4xwEAAAAAABYAFMx0rxYlpPWB3NFry4Ctk2eVi/UNeMcBAAAAA=
AAWABSzc4xK0VTfvjK0MHXrAUFLYgYnOgAAAAAAAAAAAAAAAAAAAA=3D=3D<br><br>event id=
: 976744b38fa9343fb79e1b5215512ead6ee08e5890d79a201fc5b872f6de4eba<br>```<b=
r>```<br>Signed PSBT: cHNidP8BAP1yAQIAAAAFtMaoJYcXvOG5L3Yaz3YyS7gIt4h5/zzOr=
RRS3hrVvwoAAAAAAP////+o83geaSm4L76KToIUl5MiZqLAUbIDJLq6DWrjP/3b8AEAAAAA////=
/zEF3CXIvVHpIa7No1s1yg+KtyOfXTRSyWnOdXMfzcDwAQAAAAD/////wMa4XAgnU+39Ien+KG9=
rYtv8bLMNYakmZyY/QFfwLRcAAAAAAP/////5M42ID6uLmQTb2tnFHnN7UMpnDD25uN8ZX7A+GN=
SM3QEAAAAA/////wV4xwEAAAAAABYAFLmGGov0rz71uWQT0cGSkSlB4T7MeMcBAAAAAAAWABSc0=
/FM6Hdbdxh10IJkYOklVFWqjnjHAQAAAAAAFgAUPSZKe/w6PT6qIF+WhL4wHaFymjd4xwEAAAAA=
ABYAFMx0rxYlpPWB3NFry4Ctk2eVi/UNeMcBAAAAAAAWABSzc4xK0VTfvjK0MHXrAUFLYgYnOgA=
AAAAAAQBxAgAAAAG+qpMXZCy6tBuUlgo8JD0GVXKp60FkhwDeg2sF1fkFkwMAAAAA/f///wLo9w=
EAAAAAABYAFFfLA5xarC/w/SxeMDQ5tuXrYJLUWwMAAAAAAAAWABRfPf//hwMjHB4OKj87cU19X=
OSh7yOWAQABAR/o9wEAAAAAABYAFFfLA5xarC/w/SxeMDQ5tuXrYJLUAQhrAkcwRAIgOIhLoC53=
48U8YkEr4GU1K4yWskIOEXgW4Wsk/W2cR7ICIEJXqtOuDJ5CkwrSuwJLWtzab4dslbN3KuL/pyo=
oMnOCASECRJvl+3RyUlXu61DrqTD6h3BfIemdE81xDPLB8hFTyAgAAAAAACICA77Cnd6o3kr0yc=
+91eabpOn5igs/MUMbudNYSS6oyMWMGFODDcpUAACAAQAAgAAAAIAAAAAAFAAAAAAAAAAA<br><=
br>event id: 5846b6e6902f3c5a43496d7d9785ed62444aa74963f03c33d637d8b09ee7a1=
39<br>```<br>```<br>Coinjoin tx: 75e490b10b15a6a0422f25ff66ad98ef70390c8fec=
aac02712705dce8cc3564b<br><br>event id: 9b5d4bf279b59e2b6e539e683fba83da72d=
ce2b640360aa95db1b1400be93190<br>```<br><br>There are lot of things that co=
uld be improved and a few suggestions are in the gist that described the [i=
dea][3]=2E I would love read to any opinions about this experiment and will=
 start working on creating an Android app for joinstr next week=2E<br><br>C=
redits:<br><br>- fiatjaf (Nostr)<br>- Andrew Chow (PSBT)<br>- Jeff Thibault=
 (python-nostr)<br>- Existing coinjoin implmentations<br><br>[1]: <a href=
=3D"https://github=2Ecom/1440000bytes/joinstr">https://github=2Ecom/1440000=
bytes/joinstr</a><br>[2]: <a href=3D"https://github=2Ecom/nostr-protocol/no=
str">https://github=2Ecom/nostr-protocol/nostr</a><br>[3]: <a href=3D"https=
://gist=2Egithub=2Ecom/1440000bytes/1c305097b070c8374cc3b91f50314a45">https=
://gist=2Egithub=2Ecom/1440000bytes/1c305097b070c8374cc3b91f50314a45</a><br=
><br>/dev/fd0<br><br>Sent with Proton Mail secure email=2E<hr>bitcoin-dev m=
ailing list<br>bitcoin-dev@lists=2Elinuxfoundation=2Eorg<br><a href=3D"http=
s://lists=2Elinuxfoundation=2Eorg/mailman/listinfo/bitcoin-dev">https://lis=
ts=2Elinuxfoundation=2Eorg/mailman/listinfo/bitcoin-dev</a><br></pre></bloc=
kquote></div></body></html>
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