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From: Bram Cohen <bram@bittorrent.com>
Date: Sat, 1 Apr 2017 18:27:17 -0700
Message-ID: <CA+KqGkoNyHbw_6thOPSLKK9xMVgJtkDWwCZgwhoEQm1pD8_kDw@mail.gmail.com>
To: praxeology_guy <praxeology_guy@protonmail.com>, 
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Content-Type: multipart/alternative; boundary=001a114479548185c2054c24f1a6
Subject: Re: [bitcoin-dev] Guessing the spentness status of the pruned
	relatives
Precedence: list

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On Sat, Apr 1, 2017 at 6:10 PM, praxeology_guy via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

>
> With using the MMR data structure for txo commitments, its preferable that
> wallets only keep information pertinent to their own spendable coins.  In
> previous communication we talked about how wallets could maintain the
> changing MMR proof for their old coins.  Yes wallets know which of their
> own coins are spent.  But with MMR proofs wallets also need to know the
> spentness status of close relatives in the MMR tree... in order to
> construct a valid MMR proof that their own coin is not spent.
>

Did you read the post that I made about the TXO bitfield yesterday? That
gives what I believe is a much better way of handling this whole issue,
allowing wallets to keep track of nothing other than the proof of position
of their txo, which never changes.

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On S=
at, Apr 1, 2017 at 6:10 PM, praxeology_guy via bitcoin-dev <span dir=3D"ltr=
">&lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_b=
lank">bitcoin-dev@lists.linuxfoundation.org</a>&gt;</span> wrote:<br><block=
quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc=
 solid;padding-left:1ex"><div><br></div><div>With using the MMR data struct=
ure for txo commitments, its preferable that wallets only keep information =
pertinent to their own spendable coins.=C2=A0 In previous communication we =
talked about how wallets could maintain the changing MMR proof for their ol=
d coins.=C2=A0 Yes wallets know which of their own coins are spent.=C2=A0 B=
ut with MMR proofs wallets also need to know the spentness status of close =
relatives in the MMR tree... in order to construct a valid MMR proof that t=
heir own coin is not spent.<br></div></blockquote><div><br></div><div>Did y=
ou read the post that I made about the TXO bitfield yesterday? That gives w=
hat I believe is a much better way of handling this whole issue, allowing w=
allets to keep track of nothing other than the proof of position of their t=
xo, which never changes.</div></div></div></div>

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