Date: Wed, 27 May 2020 04:11:47 +0000
To: Prayank <prayank@tutanota.de>
From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
Reply-To: ZmnSCPxj <ZmnSCPxj@protonmail.com>
Message-ID: <5cRx3Q_UFKDJkF0Jc8XcZEHHwbPxc85YbGPcITRMweC9qdfhmZLT3AVdnqpej5poLdl8t2JiHyRofBD22yv_lxFlxz2J6N8eiBHsMRM_cBQ=@protonmail.com>
In-Reply-To: <M8G151E--3-2@tutanota.de>
References: <M87d6RV--3-2@tutanota.de>
 <3K6kmk75oNFwNf_E4xqPgf5URJOf4c64Iyxi1HOgEpvvZrdn_wBWxbx3hRBEDfu2MjC5kF6N0ejpjqeG_5FTGIFD_45sFyhLCtMvhJNdq3E=@protonmail.com>
 <M8AkjX3--3-2@tutanota.de>
 <jrsxyefXxsLMundu38HnLPf8f_SnedDldcopEiFUZj0A4rsdm6NtdkNQsI3fvUd34Nf2LcLt1vnv5aAJR2bmY4keM69Xsu0uoIng2ILh9t4=@protonmail.com>
 <M8G151E--3-2@tutanota.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Post-mix(coinjoin) usage with multisig and cpfp
	in bitcoin core wallet
Precedence: list

Good morning Prayank,


> 1.  The spending tx of multisig can be decided earlier and all three can =
review the outputs involved in it. All 3 txs involved in the system if we c=
onsider only one mixer and not a chain will get confirmed in the same block=
 as we are using CPFP so child pays for 2 parent txs. However, disputes are=
 possible and to manage it we will have to make the system complex with thi=
ngs like Peer 1 locking some amount in a 2 of 2 multisig with Peer 2 or som=
e other incentives structure. Initially we can try to keep it simple and a =
way to spend coins after coinjoin with the help of another person you trust=
.

The payee is not necessary here and you can remove the intermediate transac=
tions that pay to 2-of-3s.

> 2.  Yes, you described coinjoin in joinmarket but the problem I am trying=
 to solve is: spend coins after coinjoin because post-mix usage is as impor=
tant as coinjoin. Some users dont follow the best practices after coinjoin =
and it makes coinjoin useless or less effective in that case and sometimes =
for others involved in the process as well.

...

I already mentioned this, but what I am describing is *how JoinMarket spend=
s coins from its wallet*.

That means that what I am describing is *how JoinMarket performs spends aft=
er mixing, i.e. post-mix*.

I was not describing how JoinMarket performs mixing.

Is that clearer now?


Regards,
ZmnSCPxj