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From: Craig Raw <craigraw@gmail.com>
Date: Thu, 25 Aug 2022 10:59:08 +0200
Message-ID: <CAPR5oBMccmn9PB4gT=XiGcMvy-7KrbK_yBDngS1JJKiZhzRUzA@mail.gmail.com>
To: Clark Moody <clark@clarkmoody.com>
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP Proposal: Wallet Labels Export Format
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Thanks Clark - despite having worked in the Bitcoin wallet space for a
number of years I have not come across SLIP-0015. I did try to find prior
work on this - this one escaped me.

That said, having reviewed SLIP-0015, I think it has different design
goals. For example, it requires private key derivation from seed, which
means wallets functioning as coordinators cannot use the format without
access to the devices storing the private keys. It seems to me that wallet
labels are more privacy rather than security sensitive, and coordinators
should be able to import and export a wallet label format independently.

Secondly, it uses JSON as a data format, which I wanted to avoid for
reasons I'll describe in a separate reply in this thread. Finally (and this
is minor as it could easily be extended) SLIP-0015 does not currently
support transaction labels.

Craig

On Wed, Aug 24, 2022 at 3:53 PM Clark Moody <clark@clarkmoody.com> wrote:

> Craig,
>
> Thanks for the proposal.
>
> How does this proposal compare with SLIP-0015, which provides encryption
> by default? Would it be worth exploring a merge of the two approaches?
>
> https://github.com/satoshilabs/slips/blob/master/slip-0015.md
>
> Clark
>
> ------- Original Message -------
> On Wednesday, August 24th, 2022 at 4:18 AM, Craig Raw via bitcoin-dev <
> bitcoin-dev@lists.linuxfoundation.org> wrote:
>
> Hi all,
>
> I would like to propose a BIP that specifies a format for the export and
> import of labels from a wallet. While transferring access to funds across
> wallet applications has been made simple through standards such as BIP39,
> wallet labels remain siloed and difficult to extract despite their value,
> particularly in a privacy context.
>
> The proposed format is a simple two column CSV file, with the reference t=
o
> a transaction, address, input or output in the first column, and the labe=
l
> in the second column. CSV was chosen for its wide accessibility, especial=
ly
> to users without specific technical expertise. Similarly, the CSV file ma=
y
> be compressed using the ZIP format, and optionally encrypted using AES.
>
> The full text of the BIP can be found at
> https://github.com/craigraw/bips/blob/master/bip-wallet-labels.mediawiki
> and also copied below.
>
> Feedback is appreciated.
>
> Thanks,
> Craig Raw
>
> ---
>
> <pre>
> BIP: wallet-labels
> Layer: Applications
> Title: Wallet Labels Export Format
> Author: Craig Raw <craig@sparrowwallet.com>
> Comments-Summary: No comments yet.
> Comments-URI:
> https://github.com/bitcoin/bips/wiki/Comments:BIP-wallet-labels
> Status: Draft
> Type: Informational
> Created: 2022-08-23
> License: BSD-2-Clause
> </pre>
>
> =3D=3DAbstract=3D=3D
>
> This document specifies a format for the export of labels that may be
> attached to the transactions, addresses, input and outputs in a wallet.
>
> =3D=3DCopyright=3D=3D
>
> This BIP is licensed under the BSD 2-clause license.
>
> =3D=3DMotivation=3D=3D
>
> The export and import of funds across different Bitcoin wallet
> applications is well defined through standards such as BIP39, BIP32, BIP4=
4
> etc.
> These standards are well supported and allow users to move easily between
> different wallets.
> There is, however, no defined standard to transfer any labels the user ma=
y
> have applied to the transactions, addresses, inputs or outputs in their
> wallet.
> The UTXO model that Bitcoin uses makes these labels particularly valuable
> as they may indicate the source of funds, whether received externally or =
as
> a result of change from a prior transaction.
> In both cases, care must be taken when spending to avoid undesirable leak=
s
> of private information.
> Labels provide valuable guidance in this regard, and have even become
> mandatory when spending in several Bitcoin wallets.
> Allowing users to export their labels in a standardized way ensures that
> they do not experience lock-in to a particular wallet application.
> In addition, by using common formats, this BIP seeks to make manual or
> bulk management of labels accessible to users without specific technical
> expertise.
>
> =3D=3DSpecification=3D=3D
>
> In order to make the import and export of labels as widely accessible as
> possible, this BIP uses the comma separated values (CSV) format, which is
> widely supported by consumer, business, and scientific applications.
> Although the technical specification of CSV in RFC4180 is not always
> followed, the application of the format in this BIP is simple enough that
> compatibility should not present a problem.
> Moreover, the simplicity and forgiving nature of CSV (over for example
> JSON) lends itself well to bulk label editing using spreadsheet and text
> editing tools.
>
> A CSV export of labels from a wallet must be a UTF-8 encoded text file,
> containing one record per line, with records containing two fields
> delimited by a comma.
> The fields may be quoted, but this is unnecessary, as the first comma in
> the line will always be the delimiter.
> The first line in the file is a header, and should be ignored on import.
> Thereafter, each line represents a record that refers to a label applied
> in the wallet.
> The order in which these records appear is not defined.
>
> The first field in the record contains a reference to the transaction,
> address, input or output in the wallet.
> This is specified as one of the following:
> * Transaction ID (<tt>txid</tt>)
> * Address
> * Input (rendered as <tt>txid<index</tt>)
> * Output (rendered as <tt>txid>index</tt> or <tt>txid:index</tt>)
>
> The second field contains the label applied to the reference.
> Exporting applications may omit records with no labels or labels of zero
> length.
> Files exported should use the <tt>.csv</tt> file extension.
>
> In order to reduce file size while retaining wide accessibility, the CSV
> file may be compressed using the ZIP file format, using the <tt>.zip</tt>
> file extension.
> This <tt>.zip</tt> file may optionally be encrypted using either AES-128
> or AES-256 encryption, which is supported by numerous applications
> including Winzip and 7-zip.
> In order to ensure that weak encryption does not proliferate, importers
> following this standard must refuse to import <tt>.zip</tt> files encrypt=
ed
> with the weaker Zip 2.0 standard.
> The textual representation of the wallet's extended public key (as define=
d
> by BIP32, with an <tt>xpub</tt> header) should be used as the password.
>
> =3D=3DImporting=3D=3D
>
> When importing, a naive algorithm may simply match against any reference,
> but it is possible to disambiguate between transactions, addresses, input=
s
> and outputs.
> For example in the following pseudocode:
> <pre>
> if reference length < 64
> Set address label
> else if reference length =3D=3D 64
> Set transaction label
> else if reference contains '<'
> Set input label
> else
> Set output label
> </pre>
>
> Importing applications may truncate labels if necessary.
>
> =3D=3DTest Vectors=3D=3D
>
> The following fragment represents a wallet label export:
> <pre>
> Reference,Label
>
> c3bdad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb2ad088f767b37b=E2=80=8E=
,Transaction
> 1A69TXnEM2ms9fMaY9UuiJ7415X7xZaUSg,Address
> c3bdad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb2ad088f767b37b=E2=80=8E=
<0,Input
> c3bdad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb2ad088f767b37b=E2=80=8E=
>0,Output
> c3bdad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb2ad088f767b37b=E2=80=8E=
:0,Output
> (alternative)
> </pre>
>
> =3D=3DReference Implementation=3D=3D
>
> TBD
>
>
>
>

--000000000000535bea05e70d032d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Thanks Clark - despite having worked in the Bitcoin wallet=
 space for a number of years I have not come across SLIP-0015. I did try to=
 find prior work on this - this one escaped me.=C2=A0<div><br></div><div>Th=
at said, having reviewed SLIP-0015, I think it has different design goals. =
For example, it requires private key derivation from seed, which means wall=
ets functioning as coordinators cannot use the format without access to the=
 devices storing the private keys. It seems to me that wallet labels are mo=
re privacy rather than security sensitive, and coordinators should be able =
to import and export a wallet label format independently.=C2=A0</div><div><=
br></div><div>Secondly, it uses JSON as a data format, which I wanted to av=
oid for reasons I&#39;ll describe in a separate reply in this thread. Final=
ly (and this is minor as it could easily be extended) SLIP-0015 does not cu=
rrently support transaction labels.</div><div><br></div><div>Craig</div></d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On =
Wed, Aug 24, 2022 at 3:53 PM Clark Moody &lt;<a href=3D"mailto:clark@clarkm=
oody.com" target=3D"_blank">clark@clarkmoody.com</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D"font-family:A=
rial;font-size:14px">Craig,</div><div style=3D"font-family:Arial;font-size:=
14px"><br></div><div style=3D"font-family:Arial;font-size:14px">Thanks for =
the proposal.<br></div><div style=3D"font-family:Arial;font-size:14px"><br>=
</div><div style=3D"font-family:Arial;font-size:14px">How does this proposa=
l compare with SLIP-0015, which provides encryption by default? Would it be=
 worth exploring a merge of the two approaches?<br></div><div style=3D"font=
-family:Arial;font-size:14px"><br></div><div style=3D"font-family:Arial;fon=
t-size:14px"><span><a rel=3D"noreferrer nofollow noopener" href=3D"https://=
github.com/satoshilabs/slips/blob/master/slip-0015.md" target=3D"_blank">ht=
tps://github.com/satoshilabs/slips/blob/master/slip-0015.md</a></span><br><=
/div><div style=3D"font-family:Arial;font-size:14px"><br></div>
<div style=3D"font-family:Arial;font-size:14px">
    <div>
        <div style=3D"font-family:Arial;font-size:14px;color:rgb(0,0,0)">Cl=
ark<br></div>
    </div>
   =20
            <div>
       =20
            </div>
</div>
<div style=3D"font-family:Arial;font-size:14px"><br></div><div>
        ------- Original Message -------<br>
        On Wednesday, August 24th, 2022 at 4:18 AM, Craig Raw via bitcoin-d=
ev &lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_=
blank">bitcoin-dev@lists.linuxfoundation.org</a>&gt; wrote:<br><br>
        <blockquote type=3D"cite">
            <div dir=3D"ltr">Hi all,<div><br></div><div>I would like to pro=
pose a BIP that specifies a format for the export and import of labels from=
 a wallet. While transferring access to funds across wallet applications ha=
s been made simple through standards such as BIP39, wallet labels remain si=
loed and difficult to extract despite their value, particularly in a privac=
y context.</div><div><br></div><div>The proposed format is a simple two col=
umn CSV file, with the reference to a transaction, address, input or output=
 in the first column, and the label in the second column. CSV was chosen fo=
r its wide accessibility, especially to users without specific technical ex=
pertise. Similarly, the CSV file may be compressed using the ZIP format, an=
d optionally encrypted using AES.</div><div><br></div><div>The full text of=
 the BIP can be found at <a href=3D"https://github.com/craigraw/bips/blob/m=
aster/bip-wallet-labels.mediawiki" rel=3D"noreferrer nofollow noopener" tar=
get=3D"_blank">https://github.com/craigraw/bips/blob/master/bip-wallet-labe=
ls.mediawiki</a> and also copied below.</div><div><br></div><div>Feedback i=
s appreciated.</div><div><br></div><div>Thanks,</div><div>Craig Raw</div><d=
iv><br></div><div>---</div><div><br></div><div>&lt;pre&gt;<br>  BIP: wallet=
-labels<br>  Layer: Applications<br>  Title: Wallet Labels Export Format<br=
>  Author: Craig Raw &lt;<a href=3D"mailto:craig@sparrowwallet.com" rel=3D"=
noreferrer nofollow noopener" target=3D"_blank">craig@sparrowwallet.com</a>=
&gt;<br>  Comments-Summary: No comments yet.<br>  Comments-URI: <a href=3D"=
https://github.com/bitcoin/bips/wiki/Comments:BIP-wallet-labels" rel=3D"nor=
eferrer nofollow noopener" target=3D"_blank">https://github.com/bitcoin/bip=
s/wiki/Comments:BIP-wallet-labels</a><br>  Status: Draft<br>  Type: Informa=
tional<br>  Created: 2022-08-23<br>  License: BSD-2-Clause<br>&lt;/pre&gt;<=
br><br>=3D=3DAbstract=3D=3D<br><br>This document specifies a format for the=
 export of labels that may be attached to the transactions, addresses, inpu=
t and outputs in a wallet.<br><br>=3D=3DCopyright=3D=3D<br><br>This BIP is =
licensed under the BSD 2-clause license.<br><br>=3D=3DMotivation=3D=3D<br><=
br>The export and import of funds across different Bitcoin wallet applicati=
ons is well defined through standards such as BIP39, BIP32, BIP44 etc.<br>T=
hese standards are well supported and allow users to move easily between di=
fferent wallets.<br>There is, however, no defined standard to transfer any =
labels the user may have applied to the transactions, addresses, inputs or =
outputs in their wallet.<br>The UTXO model that Bitcoin uses makes these la=
bels particularly valuable as they may indicate the source of funds, whethe=
r received externally or as a result of change from a prior transaction.<br=
>In both cases, care must be taken when spending to avoid undesirable leaks=
 of private information.<br>Labels provide valuable guidance in this regard=
, and have even become mandatory when spending in several Bitcoin wallets.<=
br>Allowing users to export their labels in a standardized way ensures that=
 they do not experience lock-in to a particular wallet application.<br>In a=
ddition, by using common formats, this BIP seeks to make manual or bulk man=
agement of labels accessible to users without specific technical expertise.=
<br><br>=3D=3DSpecification=3D=3D<br><br>In order to make the import and ex=
port of labels as widely accessible as possible, this BIP uses the comma se=
parated values (CSV) format, which is widely supported by consumer, busines=
s, and scientific applications.<br>Although the technical specification of =
CSV in RFC4180 is not always followed, the application of the format in thi=
s BIP is simple enough that compatibility should not present a problem.<br>=
Moreover, the simplicity and forgiving nature of CSV (over for example JSON=
) lends itself well to bulk label editing using spreadsheet and text editin=
g tools. <br><br>A CSV export of labels from a wallet must be a UTF-8 encod=
ed text file, containing one record per line, with records containing two f=
ields delimited by a comma.<br>The fields may be quoted, but this is unnece=
ssary, as the first comma in the line will always be the delimiter.<br>The =
first line in the file is a header, and should be ignored on import.<br>The=
reafter, each line represents a record that refers to a label applied in th=
e wallet.<br>The order in which these records appear is not defined.<br><br=
>The first field in the record contains a reference to the transaction, add=
ress, input or output in the wallet.<br>This is specified as one of the fol=
lowing:<br>* Transaction ID (&lt;tt&gt;txid&lt;/tt&gt;)<br>* Address<br>* I=
nput (rendered as &lt;tt&gt;txid&lt;index&lt;/tt&gt;)<br>* Output (rendered=
 as &lt;tt&gt;txid&gt;index&lt;/tt&gt; or &lt;tt&gt;txid:index&lt;/tt&gt;)<=
br><br>The second field contains the label applied to the reference. <br>Ex=
porting applications may omit records with no labels or labels of zero leng=
th.<br>Files exported should use the &lt;tt&gt;.csv&lt;/tt&gt; file extensi=
on.<br><br>In order to reduce file size while retaining wide accessibility,=
 the CSV file may be compressed using the ZIP file format, using the &lt;tt=
&gt;.zip&lt;/tt&gt; file extension.<br>This &lt;tt&gt;.zip&lt;/tt&gt; file =
may optionally be encrypted using either AES-128 or AES-256 encryption, whi=
ch is supported by numerous applications including Winzip and 7-zip. <br>In=
 order to ensure that weak encryption does not proliferate, importers follo=
wing this standard must refuse to import &lt;tt&gt;.zip&lt;/tt&gt; files en=
crypted with the weaker Zip 2.0 standard.<br>The textual representation of =
the wallet&#39;s extended public key (as defined by BIP32, with an &lt;tt&g=
t;xpub&lt;/tt&gt; header) should be used as the password.<br><br>=3D=3DImpo=
rting=3D=3D<br><br>When importing, a naive algorithm may simply match again=
st any reference, but it is possible to disambiguate between transactions, =
addresses, inputs and outputs. <br>For example in the following pseudocode:=
<br>&lt;pre&gt;<br>  if reference length &lt; 64<br>    Set address label<b=
r>  else if reference length =3D=3D 64<br>    Set transaction label<br>  el=
se if reference contains &#39;&lt;&#39;<br>    Set input label<br>  else<br=
>    Set output label<br>&lt;/pre&gt;<br><br>Importing applications may tru=
ncate labels if necessary.<br><br>=3D=3DTest Vectors=3D=3D<br><br>The follo=
wing fragment represents a wallet label export:<br>&lt;pre&gt;<br>Reference=
,Label<br>c3bdad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb2ad088f767b37b=
=E2=80=8E,Transaction<br>1A69TXnEM2ms9fMaY9UuiJ7415X7xZaUSg,Address<br>c3bd=
ad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb2ad088f767b37b=E2=80=8E&lt;0,=
Input<br>c3bdad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb2ad088f767b37b=
=E2=80=8E&gt;0,Output<br>c3bdad6e7dcd7997e16a5b7b7cf4d8f6079820ff2eedd5fcbb=
2ad088f767b37b=E2=80=8E:0,Output (alternative)<br>&lt;/pre&gt;<br><br>=3D=
=3DReference Implementation=3D=3D<br><br>TBD<br></div><div><br></div><div><=
br></div></div>

        </blockquote><br>
    </div></blockquote></div>

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