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| author | Peter Todd <pete@petertodd.org> | 2014-08-06 23:33:09 +0000 |
|---|---|---|
| committer | bitcoindev <bitcoindev@gnusha.org> | 2014-08-06 23:33:31 +0000 |
| commit | 708951c658ddae09dffde9fb54b188e5412ff8fc (patch) | |
| tree | 24c4c1b9b92ec8839d014fb0057e3c0e2878f36d | |
| parent | 8cc5ecf5ab93fb9e903ab08a7da0d1b7d00de1d9 (diff) | |
| download | pi-bitcoindev-708951c658ddae09dffde9fb54b188e5412ff8fc.tar.gz pi-bitcoindev-708951c658ddae09dffde9fb54b188e5412ff8fc.zip | |
[Bitcoin-development] Payment ID #'s for Stealth Addresses
| -rw-r--r-- | 92/1dafa9aee748314e1f3c6a32055bf1c9217118 | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/92/1dafa9aee748314e1f3c6a32055bf1c9217118 b/92/1dafa9aee748314e1f3c6a32055bf1c9217118 new file mode 100644 index 000000000..678ef615a --- /dev/null +++ b/92/1dafa9aee748314e1f3c6a32055bf1c9217118 @@ -0,0 +1,117 @@ +Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] + helo=mx.sourceforge.net) + by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) + (envelope-from <pete@petertodd.org>) id 1XFAi3-0002hT-DP + for bitcoin-development@lists.sourceforge.net; + Wed, 06 Aug 2014 23:33:31 +0000 +Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of petertodd.org + designates 62.13.148.101 as permitted sender) + client-ip=62.13.148.101; envelope-from=pete@petertodd.org; + helo=outmail148101.authsmtp.com; +Received: from outmail148101.authsmtp.com ([62.13.148.101]) + by sog-mx-2.v43.ch3.sourceforge.com with esmtp (Exim 4.76) + id 1XFAi1-0004WP-Ln for bitcoin-development@lists.sourceforge.net; + Wed, 06 Aug 2014 23:33:31 +0000 +Received: from mail-c237.authsmtp.com (mail-c237.authsmtp.com [62.13.128.237]) + by punt18.authsmtp.com (8.14.2/8.14.2/) with ESMTP id s76NXNwv059067; + Thu, 7 Aug 2014 00:33:23 +0100 (BST) +Received: from localhost.localdomain (tor-exit-01.thehappy3.com [178.63.97.34]) + (authenticated bits=128) + by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id s76NXCgQ067038 + (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); + Thu, 7 Aug 2014 00:33:19 +0100 (BST) +Date: Wed, 6 Aug 2014 23:33:09 +0000 +From: Peter Todd <pete@petertodd.org> +To: Bitcoin Dev <bitcoin-development@lists.sourceforge.net> +Message-ID: <20140806233309.GB9272@localhost.localdomain> +MIME-Version: 1.0 +Content-Type: multipart/signed; micalg=pgp-sha512; + protocol="application/pgp-signature"; boundary="f2QGlHpHGjS2mn6Y" +Content-Disposition: inline +User-Agent: Mutt/1.5.21 (2010-09-15) +X-Server-Quench: 0dcc07cc-1dc2-11e4-9f74-002590a135d3 +X-AuthReport-Spam: If SPAM / abuse - report it at: + http://www.authsmtp.com/abuse +X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR + aQdMdgUUGUATAgsB AmIbW1ReU157W2E7 ag1ZcwNefENJQQZu + T01BRU1TWkZvB2Jp dUl/Uh91dwZONn9w YERmEHAPDxd6chUu + X08ARm8bZGY1bH0W BkdcagNUcgZDfk5E aVUrVz1tMCxaMyQk + Vy4fd3t+Jn1RLz4d eR0AJFYOQQ4iEjIm SgsZEC5H +X-Authentic-SMTP: 61633532353630.1024:706 +X-AuthFastPath: 0 (Was 255) +X-AuthSMTP-Origin: 178.63.97.34/587 +X-AuthVirus-Status: No virus detected - but ensure you scan with your own + anti-virus system. +X-Spam-Score: -1.5 (-) +X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. + See http://spamassassin.org/tag/ for more details. + -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for + sender-domain + -0.0 SPF_PASS SPF: sender matches SPF record +X-Headers-End: 1XFAi1-0004WP-Ln +Subject: [Bitcoin-development] Payment ID #'s for Stealth Addresses +X-BeenThere: bitcoin-development@lists.sourceforge.net +X-Mailman-Version: 2.1.9 +Precedence: list +List-Id: <bitcoin-development.lists.sourceforge.net> +List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, + <mailto:bitcoin-development-request@lists.sourceforge.net?subject=unsubscribe> +List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=bitcoin-development> +List-Post: <mailto:bitcoin-development@lists.sourceforge.net> +List-Help: <mailto:bitcoin-development-request@lists.sourceforge.net?subject=help> +List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, + <mailto:bitcoin-development-request@lists.sourceforge.net?subject=subscribe> +X-List-Received-Date: Wed, 06 Aug 2014 23:33:31 -0000 + + +--f2QGlHpHGjS2mn6Y +Content-Type: text/plain; charset=us-ascii +Content-Disposition: inline + +Real-world experience with stealth address implementations used by +Cryptonote/Monero/etc. have shown that being able to attach a number of +some kind to each stealth-sent txout is valuable. For instance an +exchange with many customers can use such #'s to disambiguate payments +and credit the correct customer's account. Similarly an informal +person-to-person transaction can attach a number short enough to be +communicated verbally or on paper. Finally multiple payments with the +same ID # can be merged together in wallet UI's, allowing +merge-avoidance to be conveniently used with stealth addresses. + +To avoid accidental collision such payment #'s should be at least +64-bits; to avoid privacy loss the encoded size should be the same for +all users. Thus we pick 64-bits or 8-bytes. In addition for the purposes +of CoinJoin and multiple outputs it would be desirable for all +stealth-using outputs the option of sharing a single 33-byte ephemeral +pubkey. Thus our OP_RETURN output becomes: + + OP_RETURN <ephemeral pubkey> <payment ID 1> {<ID 2> ... <ID n>} + +Of course, this can't be accomodated within the existing 40-byte, one +OP_RETURN per tx, IsStandard() rules, something which is already causing +issues w/ Dark Wallet when users try to send to multiple stealth +addresses at once, and when multiple stealth sends are CoinJoin'd +together. + +1) "Merge avoidance", Dec 11th 2013, Mike Hearn, + https://medium.com/@octskyward/merge-avoidance-7f95a386692f + + +--f2QGlHpHGjS2mn6Y +Content-Type: application/pgp-signature; name="signature.asc" +Content-Description: Digital signature + +-----BEGIN PGP SIGNATURE----- + +iQEcBAEBCgAGBQJT4rsrAAoJEH+rEUJn5PoEABQH/37VgBgyjzeEcOlIw58R+NlM +S7xm2/Z6twLylVByINopLoGJu5nQMUO8MARg/4jmFXCsPNcznMNHlsA/EdwU+tce +sBdHA5q++dmzhFy2XpyLt7S3zeLqH7j9lzrvCq7JLth+iawVqmH0clT8NZLgppuJ +3Az3RMunLZPAA4BeQpeQHhm6cDCFFuL4CNdNFpCIqbglyOsBLlx0+cuQDT24XNnG +0UIs+Ewttw5QQ28e6uy7p9J7mzo5lViRi6TYbA2FQSmUfDVltr7S5wJtjN6LIBgO +neBVk57wHSejUyknCYPv/3PjD5rcc/tlU7nC/6EBd+DyF8836JKdzP51A0iUJo0= +=Jk/r +-----END PGP SIGNATURE----- + +--f2QGlHpHGjS2mn6Y-- + + |