From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1VAhI2-00044F-7p for bitcoin-development@lists.sourceforge.net; Sat, 17 Aug 2013 14:15:38 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.128.48 as permitted sender) client-ip=209.85.128.48; envelope-from=pieter.wuille@gmail.com; helo=mail-qe0-f48.google.com; Received: from mail-qe0-f48.google.com ([209.85.128.48]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1VAhI1-0000Z6-AI for bitcoin-development@lists.sourceforge.net; Sat, 17 Aug 2013 14:15:38 +0000 Received: by mail-qe0-f48.google.com with SMTP id 3so87763qea.21 for ; Sat, 17 Aug 2013 07:15:31 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.224.54.210 with SMTP id r18mr3483836qag.62.1376748931797; Sat, 17 Aug 2013 07:15:31 -0700 (PDT) Received: by 10.49.96.165 with HTTP; Sat, 17 Aug 2013 07:15:31 -0700 (PDT) Received: by 10.49.96.165 with HTTP; Sat, 17 Aug 2013 07:15:31 -0700 (PDT) In-Reply-To: References: Date: Sat, 17 Aug 2013 16:15:31 +0200 Message-ID: From: Pieter Wuille To: Jeff Garzik Content-Type: multipart/alternative; boundary=089e01537274065b7b04e425579c X-Spam-Score: -0.6 (/) 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 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (pieter.wuille[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 1.0 HTML_MESSAGE BODY: HTML included in message -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-Headers-End: 1VAhI1-0000Z6-AI Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Combining bloom filters? X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Aug 2013 14:15:38 -0000 --089e01537274065b7b04e425579c Content-Type: text/plain; charset=ISO-8859-1 If both constructed bloom filters use the same seed and the same number of hash functions, yes. Assuming the input filters were optimal for a given FP rate, the resulting filter will be worse. -- Pieter On 17 Aug 2013 16:01, "Jeff Garzik" wrote: > Consider wallet A builds bloom filter A' and wallet B builds bloom > filter B'. Can A' and B' be or'd together to form a single bloom > filter C' ? > > -- > Jeff Garzik > Senior Software Engineer and open source evangelist > BitPay, Inc. https://bitpay.com/ > > > ------------------------------------------------------------------------------ > Get 100% visibility into Java/.NET code with AppDynamics Lite! > It's a free troubleshooting tool designed for production. > Get down to code-level detail for bottlenecks, with <2% overhead. > Download for free and get started troubleshooting in minutes. > http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk > _______________________________________________ > Bitcoin-development mailing list > Bitcoin-development@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bitcoin-development > --089e01537274065b7b04e425579c Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

If both constructed bloom filters use the same seed and the = same number of hash functions, yes. Assuming the input filters were optimal= for a given FP rate, the resulting filter will be worse.

--
Pieter

On 17 Aug 2013 16:01, "Jeff Garzik" &l= t;jgarzik@bitpay.com> wrote:
Consider wallet A builds bloom filter A' and wallet B builds bloom
filter B'. =A0Can A' and B' be or'd together to form a sing= le bloom
filter C' ?

--
Jeff Garzik
Senior Software Engineer and open source evangelist
BitPay, Inc. =A0 =A0 =A0h= ttps://bitpay.com/

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