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References: <4eb70284-cfef-b795-5745-735de349fae5@towardsliberty.com>
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From: nopara73 <adam.ficsor73@gmail.com>
Date: Tue, 1 Mar 2022 23:50:24 +0100
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To: Max Hillebrand <max@towardsliberty.com>, 
 Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] Wasabi Wallet 2.0 Testnet Release
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The first Wasabi Wallet 2.0 testnet coinjoin with real users:
https://blockstream.info/testnet/tx/68849dc71e6eb860b4b8aa3f57b9bc8178a002b=
54f85a46305bfaaad28b40444

On Tue, Mar 1, 2022 at 11:27 PM Max Hillebrand via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Hello list,
>
> tl;dr: we have been working on a little something, and Wasabi 2.0 is now
> ready for your review and feedback.
>
> Wasabi Wallet 2.0 is a Bitcoin wallet providing effortless privacy for
> its users. Just like Wasabi 1.0, this is achieved by default on the
> network layer with a deep Tor integration, and on the synchronization
> layer with BIP158 block filters or the packaged Bitcoin full node.
> However, 2.0 upgrades the privacy on the blockchain layer with a new
> Wabisabi coinjoin implementation, running by default in the background.
>
> Wabisabi is a drop-in replacement for the ZeroLink coinjoin coordination
> protocol. Instead of Chaumian [or Schnorr] blind signatures, it uses
> keyed verified anonymous credentials and Pedersen commitments. This
> enables anonymous DoS protection for centrally coordinated coinjoins
> without relying on equal amount outputs. This flexibility in the
> coordination enables a more sophisticated amount decomposition,
> specifically with standard denominations of low Hamming weight, in our
> case powers of two, powers of three, and the preferred value series [1,
> 2, 5]. In our simulations, this results often in "changeless" coinjoins
> [all outputs at least two anonymity set, aka count of equal value
> outputs] for transactions with more than 50 inputs. Whereas in Wasabi
> 1.0 each user had to participate in the smallest standard denomination
> of 0.1 btc, now there is no mandatory output decomposition, and the
> minimum amount is 5000 sats. This is **substantial** block space
> savings, reducing the amount of mining fees paid, and the time until the
> user's utxo set is private.
>
> Thanks to these efficiency improvements, we are now comformaking
> coinjoin transactions the default in Wasabi's UX. As soon as bitcoin is
> received in the wallet, the client will register the confirmed coin as
> input for the PSBT with the backend coordinator. Within a couple hours,
> the user has numerous utxos which can be spent privately without
> revealing their pre-mix transaction history. The resulting UX is simple:
> receive, wait, spend. Privately. Effortless. For everyone.
>
> Whenever the user wants to spend bitcoin to an address, the wallet
> automatically selects those private coins with sufficient sats, coin
> control is displayed to the user. However, when the private balance is
> insufficient to make the payment, the user has the option to adjust the
> coin selection with the help of the previously provided contact labels.
> Since labeling is mandatory in Wasabi, we can abstract away the utxo
> concept and display only the contact labels for the users to choose
> from. Wasabi also suggests the user to slightly adjust the payment
> amount so as to avoid the creation of a change utxo, decreasing fees and
> improving future privacy.
>
> Today, we are proud to finally reveal our work in progress in a public
> preview release with coinjoin on testnet. We kindly ask for your help
> testing the completely new UI/UX, reviewing the cryptography and
> coordination protocol, and especially coinjoining to analyze the
> resulting transaction graph in the wild.
>
> Thank you to all contributors past and present!
>
> Skol
> Max Hillebrand
>
> Download the testnet release:
> https://github.com/zkSNACKs/WalletWasabi/releases/tag/v1.98.0.0
>
> Website: https://wasabiwallet.io
> Onion:
> http://wasabiukrxmkdgve5kynjztuovbg43uxcbcxn6y2okcrsg7gb6jdmbad.onion
> Testnet coordinator:
> http://testwnp3fugjln6vh5vpj7mvq3lkqqwjj3c2aafyu7laxz42kgwh2rad.onion
>
>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>


--=20
Best,
=C3=81d=C3=A1m

--0000000000003439cd05d92ffe28
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><span style=3D"font-family:verdana,arial,helvetica,sans-se=
rif;font-size:14px">The first Wasabi Wallet 2.0 testnet coinjoin with real =
users:=C2=A0</span><a href=3D"https://blockstream.info/testnet/tx/68849dc71=
e6eb860b4b8aa3f57b9bc8178a002b54f85a46305bfaaad28b40444" style=3D"text-deco=
ration-line:none;color:rgb(0,121,211);margin:0px;font-family:verdana,arial,=
helvetica,sans-serif;font-size:14px">https://blockstream.info/testnet/tx/68=
849dc71e6eb860b4b8aa3f57b9bc8178a002b54f85a46305bfaaad28b40444</a><br></div=
><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tu=
e, Mar 1, 2022 at 11:27 PM Max Hillebrand via bitcoin-dev &lt;<a href=3D"ma=
ilto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-dev@lists.linuxfoundati=
on.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex">Hello list,<br>
<br>
tl;dr: we have been working on a little something, and Wasabi 2.0 is now <b=
r>
ready for your review and feedback.<br>
<br>
Wasabi Wallet 2.0 is a Bitcoin wallet providing effortless privacy for <br>
its users. Just like Wasabi 1.0, this is achieved by default on the <br>
network layer with a deep Tor integration, and on the synchronization <br>
layer with BIP158 block filters or the packaged Bitcoin full node. <br>
However, 2.0 upgrades the privacy on the blockchain layer with a new <br>
Wabisabi coinjoin implementation, running by default in the background.<br>
<br>
Wabisabi is a drop-in replacement for the ZeroLink coinjoin coordination <b=
r>
protocol. Instead of Chaumian [or Schnorr] blind signatures, it uses <br>
keyed verified anonymous credentials and Pedersen commitments. This <br>
enables anonymous DoS protection for centrally coordinated coinjoins <br>
without relying on equal amount outputs. This flexibility in the <br>
coordination enables a more sophisticated amount decomposition, <br>
specifically with standard denominations of low Hamming weight, in our <br>
case powers of two, powers of three, and the preferred value series [1, <br=
>
2, 5]. In our simulations, this results often in &quot;changeless&quot; coi=
njoins <br>
[all outputs at least two anonymity set, aka count of equal value <br>
outputs] for transactions with more than 50 inputs. Whereas in Wasabi <br>
1.0 each user had to participate in the smallest standard denomination <br>
of 0.1 btc, now there is no mandatory output decomposition, and the <br>
minimum amount is 5000 sats. This is **substantial** block space <br>
savings, reducing the amount of mining fees paid, and the time until the <b=
r>
user&#39;s utxo set is private.<br>
<br>
Thanks to these efficiency improvements, we are now comformaking <br>
coinjoin transactions the default in Wasabi&#39;s UX. As soon as bitcoin is=
 <br>
received in the wallet, the client will register the confirmed coin as <br>
input for the PSBT with the backend coordinator. Within a couple hours, <br=
>
the user has numerous utxos which can be spent privately without <br>
revealing their pre-mix transaction history. The resulting UX is simple: <b=
r>
receive, wait, spend. Privately. Effortless. For everyone.<br>
<br>
Whenever the user wants to spend bitcoin to an address, the wallet <br>
automatically selects those private coins with sufficient sats, coin <br>
control is displayed to the user. However, when the private balance is <br>
insufficient to make the payment, the user has the option to adjust the <br=
>
coin selection with the help of the previously provided contact labels. <br=
>
Since labeling is mandatory in Wasabi, we can abstract away the utxo <br>
concept and display only the contact labels for the users to choose <br>
from. Wasabi also suggests the user to slightly adjust the payment <br>
amount so as to avoid the creation of a change utxo, decreasing fees and <b=
r>
improving future privacy.<br>
<br>
Today, we are proud to finally reveal our work in progress in a public <br>
preview release with coinjoin on testnet. We kindly ask for your help <br>
testing the completely new UI/UX, reviewing the cryptography and <br>
coordination protocol, and especially coinjoining to analyze the <br>
resulting transaction graph in the wild.<br>
<br>
Thank you to all contributors past and present!<br>
<br>
Skol<br>
Max Hillebrand<br>
<br>
Download the testnet release: <br>
<a href=3D"https://github.com/zkSNACKs/WalletWasabi/releases/tag/v1.98.0.0"=
 rel=3D"noreferrer" target=3D"_blank">https://github.com/zkSNACKs/WalletWas=
abi/releases/tag/v1.98.0.0</a><br>
<br>
Website: <a href=3D"https://wasabiwallet.io" rel=3D"noreferrer" target=3D"_=
blank">https://wasabiwallet.io</a><br>
Onion: <a href=3D"http://wasabiukrxmkdgve5kynjztuovbg43uxcbcxn6y2okcrsg7gb6=
jdmbad.onion" rel=3D"noreferrer" target=3D"_blank">http://wasabiukrxmkdgve5=
kynjztuovbg43uxcbcxn6y2okcrsg7gb6jdmbad.onion</a><br>
Testnet coordinator: <br>
<a href=3D"http://testwnp3fugjln6vh5vpj7mvq3lkqqwjj3c2aafyu7laxz42kgwh2rad.=
onion" rel=3D"noreferrer" target=3D"_blank">http://testwnp3fugjln6vh5vpj7mv=
q3lkqqwjj3c2aafyu7laxz42kgwh2rad.onion</a><br>
<br>
<br>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">=
bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.org/mail=
man/listinfo/bitcoin-dev</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div=
 dir=3D"ltr"><div><div><span style=3D"font-size:13.3333px">Best,<br>=C3=81d=
=C3=A1m</span></div></div></div></div></div></div></div></div>

--0000000000003439cd05d92ffe28--