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Date: Sat, 25 Apr 2015 02:22:30 +0200
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From: Justus Ranvier <justus.ranvier@monetas.net>
To: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
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Subject: [Bitcoin-development] Fwd:  Reusable payment codes
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Taking the hash of the secret would then require an extra step to make sure
the hash is valid for secp256k1.

Using the x value directly avoids the need for that check.

On Fri, Apr 24, 2015 at 10:35 PM, Patrick Mccorry (PGR) <
patrick.mccorry@newcastle.ac.uk> wrote:

>  When computing the diffie Hellman secret - why do you choose the x
> co-ordinate instead of the hash of the secret which is standard practice
> for stealth addresses
>
> Sent from my iPhone
>
> On 24 Apr 2015, at 21:27, Justus Ranvier <justus.ranvier@monetas.net>
> wrote:
>
>   -----BEGIN PGP SIGNED MESSAGE-----
>
> Hash: SHA1
>
>
>
> https://github.com/justusranvier/rfc/blob/payment_code/bips/bip-pc01.mediawiki
>
>
>  This link contains an RFC for a new type of Bitcoin address called a
> "payment code"
>
>
>  Payment codes are SPV-friendly alternatives to DarkWallet-style stealth
> addresses which provide useful features such as positively identifying
> senders to recipients and automatically providing for transaction refunds.
>
>
>  Payment codes can be publicly advertised and associated with a real-life
> identity without causing a loss of financial privacy.
>
>
>  Compared to stealth addresses, payment codes require less blockchain
> data storage.
>
>
>  Payment codes require 65 bytes of OP_RETURN data per sender-recipient
> pair, while stealth addresses require 40 bytes per transaction.
>
>
>  -----BEGIN PGP SIGNATURE-----
>
> Version: GnuPG v1
>
>
>  iQIcBAEBAgAGBQJVOqCRAAoJECpf2nDq2eYjluEP/RVJk+miDIihY4ilIvUbKvMd
>
> JLLqHr7Q1dlZyMIG/UqVWdoP5hzg/16B+q2iAB9jXozPnrDp0mggBh6rIGroevAa
>
> Kqfrs+Rrog1w9auhd67LWORDqav6YIrjTJIxdLxe11IEiq5rWbHPNUEDMzdEmHbz
>
> QfTH7KWAP2BasO5ETXcfu6BcccrXZ3XOKLON2h3NGD/cEDizY+uT2k3QN54z+KxG
>
> NB9scKbzVvsJwkyBrgbV+As9H3k6PnFsojYgAaE9gkp7D2+ahjzUiOH5rv6TbbYR
>
> o2X5MOiTY2/YZEqZPG7IR03ZAgeLVCvXXysjPOfzUKbmTF4w849sm8BuhixzDXHo
>
> 2V/HHKoGclIohcODBCWi0tVQXshZt4QkCNJBW5o3nL6Nn2YOp6hmw8YKAHnw3E7h
>
> /wIgk5f+NOLl/iIxoAxAdavEj5P6N4ic+OB6MAjnhEilWfBvCIpqWLGNvrtOhEa9
>
> EnPHcgb4ILBu4OionJhsNpJ/O95C0OEypMm25MIS+rQcV4Uxe5IOS2OuT/GreLET
>
> n/7Y0mJbqYbLBjVsfS+DNjvsgyJl5AxhcMrdVyXJjSYVcCoRhcoX5Ceidd+YkbHI
>
> OMs5f63tM1Rgi/WY4Ct80SD5EbULZuu8j1KJ9HPGuMt081JSBH+L5isiKuazPeO+
>
> SGApMBd4Q89fKzL2djae
>
> =Dypr
>
> -----END PGP SIGNATURE-----
>
>
> ------------------------------------------------------------------------------
> One dashboard for servers and applications across Physical-Virtual-Cloud
> Widest out-of-the-box monitoring support with 50+ applications
> Performance metrics, stats and reports that give you Actionable Insights
> Deep dive visibility with transaction tracing using APM Insight.
> http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
>
>  _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>

--90e6ba2121e522df3f05148182e5
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr">Taking the has=
h of the secret would then require an extra step to make sure the hash is v=
alid for secp256k1.<br><br>Using the x value directly avoids the need for t=
hat check.</div><div class=3D"HOEnZb"><div class=3D"h5"><div class=3D"gmail=
_extra"><br><div class=3D"gmail_quote">On Fri, Apr 24, 2015 at 10:35 PM, Pa=
trick Mccorry (PGR) <span dir=3D"ltr">&lt;<a href=3D"mailto:patrick.mccorry=
@newcastle.ac.uk" target=3D"_blank">patrick.mccorry@newcastle.ac.uk</a>&gt;=
</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .=
8ex;border-left:1px #ccc solid;padding-left:1ex">



<div dir=3D"auto">
<div>When computing the diffie Hellman secret - why do you choose the x co-=
ordinate instead of the hash of the secret which is standard practice for s=
tealth addresses=C2=A0<br>
<br>
Sent from my iPhone</div><div><div>
<div><br>
On 24 Apr 2015, at 21:27, Justus Ranvier &lt;<a href=3D"mailto:justus.ranvi=
er@monetas.net" target=3D"_blank">justus.ranvier@monetas.net</a>&gt; wrote:=
<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
<div dir=3D"ltr">
<p style=3D"margin:0px">-----BEGIN PGP SIGNED MESSAGE-----</p>
<p style=3D"margin:0px">Hash: SHA1</p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px"><a href=3D"https://github.com/justusranvier/rfc/blo=
b/payment_code/bips/bip-pc01.mediawiki" target=3D"_blank">https://github.co=
m/justusranvier/rfc/blob/payment_code/bips/bip-pc01.mediawiki</a></p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px">This link contains an RFC for a new type of Bitcoin=
 address called a &quot;payment code&quot;</p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px">Payment codes are SPV-friendly alternatives to Dark=
Wallet-style stealth addresses which provide useful features such as positi=
vely identifying senders to recipients and automatically providing for tran=
saction refunds.</p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px">Payment codes can be publicly advertised and associ=
ated with a real-life identity without causing a loss of financial privacy.=
</p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px">Compared to stealth addresses, payment codes requir=
e less blockchain data storage.</p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px">Payment codes require 65 bytes of OP_RETURN data pe=
r sender-recipient pair, while stealth addresses require 40 bytes per trans=
action.</p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px">-----BEGIN PGP SIGNATURE-----</p>
<p style=3D"margin:0px">Version: GnuPG v1</p>
<p style=3D"margin:0px"><br>
</p>
<p style=3D"margin:0px">iQIcBAEBAgAGBQJVOqCRAAoJECpf2nDq2eYjluEP/RVJk+miDIi=
hY4ilIvUbKvMd</p>
<p style=3D"margin:0px">JLLqHr7Q1dlZyMIG/UqVWdoP5hzg/16B+q2iAB9jXozPnrDp0mg=
gBh6rIGroevAa</p>
<p style=3D"margin:0px">Kqfrs+Rrog1w9auhd67LWORDqav6YIrjTJIxdLxe11IEiq5rWbH=
PNUEDMzdEmHbz</p>
<p style=3D"margin:0px">QfTH7KWAP2BasO5ETXcfu6BcccrXZ3XOKLON2h3NGD/cEDizY+u=
T2k3QN54z+KxG</p>
<p style=3D"margin:0px">NB9scKbzVvsJwkyBrgbV+As9H3k6PnFsojYgAaE9gkp7D2+ahjz=
UiOH5rv6TbbYR</p>
<p style=3D"margin:0px">o2X5MOiTY2/YZEqZPG7IR03ZAgeLVCvXXysjPOfzUKbmTF4w849=
sm8BuhixzDXHo</p>
<p style=3D"margin:0px">2V/HHKoGclIohcODBCWi0tVQXshZt4QkCNJBW5o3nL6Nn2YOp6h=
mw8YKAHnw3E7h</p>
<p style=3D"margin:0px">/wIgk5f+NOLl/iIxoAxAdavEj5P6N4ic+OB6MAjnhEilWfBvCIp=
qWLGNvrtOhEa9</p>
<p style=3D"margin:0px">EnPHcgb4ILBu4OionJhsNpJ/O95C0OEypMm25MIS+rQcV4Uxe5I=
OS2OuT/GreLET</p>
<p style=3D"margin:0px">n/7Y0mJbqYbLBjVsfS+DNjvsgyJl5AxhcMrdVyXJjSYVcCoRhco=
X5Ceidd+YkbHI</p>
<p style=3D"margin:0px">OMs5f63tM1Rgi/WY4Ct80SD5EbULZuu8j1KJ9HPGuMt081JSBH+=
L5isiKuazPeO+</p>
<p style=3D"margin:0px">SGApMBd4Q89fKzL2djae</p>
<p style=3D"margin:0px">=3DDypr</p>
<p style=3D"margin:0px">-----END PGP SIGNATURE-----</p>
</div>
</div>
</blockquote>
</div></div><blockquote type=3D"cite">
<div><span>----------------------------------------------------------------=
--------------</span><br>
<span>One dashboard for servers and applications across Physical-Virtual-Cl=
oud </span>
<br>
<span>Widest out-of-the-box monitoring support with 50+ applications</span>=
<br>
<span>Performance metrics, stats and reports that give you Actionable Insig=
hts</span><br>
<span>Deep dive visibility with transaction tracing using APM Insight.</spa=
n><br>
<span><a href=3D"http://ad.doubleclick.net/ddm/clk/290420510;117567292;y" t=
arget=3D"_blank">http://ad.doubleclick.net/ddm/clk/290420510;117567292;y</a=
></span></div>
</blockquote>
<blockquote type=3D"cite">
<div><span>_______________________________________________</span><br>
<span>Bitcoin-development mailing list</span><br>
<span><a href=3D"mailto:Bitcoin-development@lists.sourceforge.net" target=
=3D"_blank">Bitcoin-development@lists.sourceforge.net</a></span><br>
<span><a href=3D"https://lists.sourceforge.net/lists/listinfo/bitcoin-devel=
opment" target=3D"_blank">https://lists.sourceforge.net/lists/listinfo/bitc=
oin-development</a></span><br>
</div>
</blockquote>
</div>

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

--90e6ba2121e522df3f05148182e5--