From: Justus Ranvier <justus.ranvier@monetas•net>
To: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: [Bitcoin-development] Fwd: Reusable payment codes
Date: Sat, 25 Apr 2015 02:22:30 +0200 [thread overview]
Message-ID: <CAHabJ+PMdQ-f7G8RNz0R7mfGUwBMAsnCyO=NmQhxyq0+gB1aPg@mail.gmail.com> (raw)
In-Reply-To: <CAHabJ+NDqMN-rQ1BN1TfOjGLQHH-3Wd28LdoF95Agn4HdRrThg@mail.gmail.com>
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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-----
>
>
> ------------------------------------------------------------------------------
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> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>
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next prev parent reply other threads:[~2015-04-25 0:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-24 20:00 [Bitcoin-development] " Justus Ranvier
2015-04-24 20:58 ` Gregory Maxwell
[not found] ` <CAHabJ+MtWJS=e3tkGih=xoP4ARgHe8X=D_p9OWTnRJi0z9epBw@mail.gmail.com>
2015-04-25 0:20 ` [Bitcoin-development] Fwd: " Justus Ranvier
[not found] ` <CAHabJ+Oabx80+_1KutfrPUt5QEnMivfNeeh4uJJJOsiHRQqSZw@mail.gmail.com>
2015-04-25 0:21 ` Justus Ranvier
[not found] ` <1AE7B0A2-90EE-42EE-9D30-4DC1B5892E53@newcastle.ac.uk>
[not found] ` <CAHabJ+NDqMN-rQ1BN1TfOjGLQHH-3Wd28LdoF95Agn4HdRrThg@mail.gmail.com>
2015-04-25 0:22 ` Justus Ranvier [this message]
[not found] ` <CAAS2fgSAT2otym64oUACpWD8jWLAB6dBusONn-WUx2DK59SB5w@mail.gmail.com>
2015-04-25 2:34 ` Justus Ranvier
2015-04-26 12:58 ` Mike Hearn
2015-04-26 14:50 ` Justus Ranvier
2015-06-16 16:26 ` [Bitcoin-development] " odinn
2015-06-16 17:46 ` Peter Todd
2015-06-17 5:34 ` odinn
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