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+From: Ben Carman <benthecarman@live.com>

+To: alicexbt <alicexbt@protonmail.com>, Bitcoin Protocol Discussion

+ <bitcoin-dev@lists.linuxfoundation.org>

+Thread-Topic: [bitcoin-dev] Coinjoin with less steps using ALL|ANYONECANPAY

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+Subject: Re: [bitcoin-dev] Coinjoin with less steps using ALL|ANYONECANPAY

+X-BeenThere: bitcoin-dev@lists.linuxfoundation.org

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+

+--_000_SJ1P223MB0531D7D62140F0516A25897AA1439SJ1P223MB0531NAMP_

+Content-Type: text/plain; charset="iso-8859-1"

+Content-Transfer-Encoding: quoted-printable

+

+The problem with using ALL|ANYONECANPAY is that you cannot verify beforehan=

+d that the other inputs are the inputs you want added to the transaction.

+

+Some examples of bad things that could happen:

+

+

+ * Coordinator adds its own inputs, you still get your outputs but effec=

+tively paid fees for no privacy gain

+ * The inputs added could be paying at a lower fee rate than expected, c=

+ausing the tx to take longer than what you paid for

+ * Different input types or amount are added so you no longer have the s=

+ame uniformity across the inputs

+ * (if you care) An input from a sanctioned address is added, causing yo=

+u to get "tainted" coins.

+

+This is the code in ln-vortex that verifies the psbt on the client side if =

+you are curious

+

+https://github.com/ln-vortex/ln-vortex/blob/master/client/src/main/scala/co=

+m/lnvortex/client/VortexClient.scala#L616

+

+

+Best,

+

+benthecarman

+

+________________________________

+From: bitcoin-dev <bitcoin-dev-bounces@lists.linuxfoundation.org> on behalf=

+ of alicexbt via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>

+Sent: Monday, May 22, 2023 7:51 AM

+To: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>

+Subject: [bitcoin-dev] Coinjoin with less steps using ALL|ANYONECANPAY

+

+Hi Bitcoin Developers,

+

+I recently experimented with different sighash flags, PSBTs and realized AL=

+L|ANYONECANPAY could be used to reduce some steps in coinjoin.

+

+Steps:

+

+- Register outputs.

+- One user creates a signed PSBT with 1 input, all registered outputs and A=

+LL|ANYONECANPAY sighash flag. Other participants keep adding their inputs t=

+o PSBT.

+- Finalize and broadcast the transaction.

+

+Proof of Concept (Aice and Bob): https://gitlab.com/-/snippets/2542297

+

+Tx: https://mempool.space/testnet/tx/c6dd626591dca7e25bbd516f01b23171eb0f2b=

+623471fcf8e073c87c1179c492

+

+I plan to use this in joinstr if there are no major drawbacks and it can ev=

+en be implemented by other coinjoin implementations.

+

+/dev/fd0

+floppy disk guy

+

+Sent with Proton Mail secure email.

+_______________________________________________

+bitcoin-dev mailing list

+bitcoin-dev@lists.linuxfoundation.org

+https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev

+

+--_000_SJ1P223MB0531D7D62140F0516A25897AA1439SJ1P223MB0531NAMP_

+Content-Type: text/html; charset="iso-8859-1"

+Content-Transfer-Encoding: quoted-printable

+

+<html>

+<head>

+<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=

+1">

+<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=

+ttom:0;} </style>

+</head>

+<body dir=3D"ltr">

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0">

+The problem with using ALL|ANYONECANPAY is that you cannot verify beforehan=

+d that the other inputs are the inputs you want added to the transaction.</=

+div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0">

+<br>

+</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0">

+Some examples of bad things that could happen:</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0">

+<br>

+</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0">

+<ul data-editing-info=3D"{&quot;orderedStyleType&quot;:1,&quot;unorderedSty=

+leType&quot;:2}">

+<li style=3D"list-style-type: &quot;- &quot;;"><span>Coordinator adds its o=

+wn inputs, you still get your outputs but effectively paid fees for no priv=

+acy gain</span></li><li style=3D"list-style-type: &quot;- &quot;;"><span>Th=

+e inputs added could be paying at a lower fee rate than expected, causing t=

+he tx to take longer than what you paid for</span></li><li style=3D"list-st=

+yle-type: &quot;- &quot;;"><span>Different input types or amount are added =

+so you no longer have the same uniformity across the inputs</span></li><li =

+style=3D"list-style-type: &quot;- &quot;;"><span>(if you care) An input fro=

+m a sanctioned address is added, causing you to get &quot;tainted&quot; coi=

+ns.<br>

+</span></li></ul>

+</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0 ContentPasted=

+1">

+This is the code in ln-vortex that verifies the psbt on the client side if =

+you are curious<br>

+<br>

+<a href=3D"https://github.com/ln-vortex/ln-vortex/blob/master/client/src/ma=

+in/scala/com/lnvortex/client/VortexClient.scala#L616" id=3D"LPNoLPOWALinkPr=

+eview">https://github.com/ln-vortex/ln-vortex/blob/master/client/src/main/s=

+cala/com/lnvortex/client/VortexClient.scala#L616</a>

+<div class=3D"_Entity _EType_OWALinkPreview _EId_OWALinkPreview _EReadonly_=

+1"></div>

+<br>

+</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0 ContentPasted=

+1">

+<br>

+</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0 ContentPasted=

+1">

+Best,</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0 ContentPasted=

+1">

+<br>

+</div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);" class=3D"elementToProof ContentPasted0 ContentPasted=

+1">

+benthecarman<br>

+</div>

+<div id=3D"appendonsend"></div>

+<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=

+ color: rgb(0, 0, 0);">

+<br>

+</div>

+<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">

+<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font style=3D"font-size: 11pt; color=

+: rgb(0, 0, 0);" face=3D"Calibri, sans-serif"><b>From:</b> bitcoin-dev &lt;=

+bitcoin-dev-bounces@lists.linuxfoundation.org&gt; on behalf of alicexbt via=

+ bitcoin-dev &lt;bitcoin-dev@lists.linuxfoundation.org&gt;<br>

+<b>Sent:</b> Monday, May 22, 2023 7:51 AM<br>

+<b>To:</b> Bitcoin Protocol Discussion &lt;bitcoin-dev@lists.linuxfoundatio=

+n.org&gt;<br>

+<b>Subject:</b> [bitcoin-dev] Coinjoin with less steps using ALL|ANYONECANP=

+AY</font>

+<div>&nbsp;</div>

+</div>

+<div class=3D"BodyFragment"><font size=3D"2"><span style=3D"font-size:11pt"=

+>

+<div class=3D"PlainText">Hi Bitcoin Developers,<br>

+<br>

+I recently experimented with different sighash flags, PSBTs and realized AL=

+L|ANYONECANPAY could be used to reduce some steps in coinjoin.<br>

+<br>

+Steps:<br>

+<br>

+- Register outputs.<br>

+- One user creates a signed PSBT with 1 input, all registered outputs and A=

+LL|ANYONECANPAY sighash flag. Other participants keep adding their inputs t=

+o PSBT.<br>

+- Finalize and broadcast the transaction.<br>

+<br>

+Proof of Concept (Aice and Bob):&nbsp;<a href=3D"https://gitlab.com/-/snipp=

+ets/2542297" data-auth=3D"NotApplicable">https://gitlab.com/-/snippets/2542=

+297</a><br>

+<br>

+Tx: <a href=3D"https://mempool.space/testnet/tx/c6dd626591dca7e25bbd516f01b=

+23171eb0f2b623471fcf8e073c87c1179c492" data-auth=3D"NotApplicable">

+https://mempool.space/testnet/tx/c6dd626591dca7e25bbd516f01b23171eb0f2b6234=

+71fcf8e073c87c1179c492</a><br>

+<br>

+I plan to use this in joinstr if there are no major drawbacks and it can ev=

+en be implemented by other coinjoin implementations.

+<br>

+<br>

+/dev/fd0<br>

+floppy disk guy<br>

+<br>

+Sent with Proton Mail secure email.<br>

+_______________________________________________<br>

+bitcoin-dev mailing list<br>

+bitcoin-dev@lists.linuxfoundation.org<br>

+<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =

+data-auth=3D"NotApplicable">https://lists.linuxfoundation.org/mailman/listi=

+nfo/bitcoin-dev</a><br>

+</div>

+</span></font></div>

+</body>

+</html>

+

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+