* [Bitcoin-development] Combining bloom filters?
@ 2013-08-17 14:00 Jeff Garzik
2013-08-17 14:03 ` bitcoin-list
2013-08-17 14:15 ` Pieter Wuille
0 siblings, 2 replies; 3+ messages in thread
From: Jeff Garzik @ 2013-08-17 14:00 UTC (permalink / raw)
To: Mike Hearn; +Cc: Bitcoin Dev
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/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Bitcoin-development] Combining bloom filters?
2013-08-17 14:00 [Bitcoin-development] Combining bloom filters? Jeff Garzik
@ 2013-08-17 14:03 ` bitcoin-list
2013-08-17 14:15 ` Pieter Wuille
1 sibling, 0 replies; 3+ messages in thread
From: bitcoin-list @ 2013-08-17 14:03 UTC (permalink / raw)
To: Jeff Garzik, Mike Hearn; +Cc: Bitcoin Dev
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Under some conditions, yes. The filters must have the same parameters (tweak, size, hash count). Bitcoinj implements this in its BloomFilter class.
Matt
Jeff Garzik <jgarzik@bitpay•com> 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/
>
>------------------------------------------------------------------------------
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Bitcoin-development] Combining bloom filters?
2013-08-17 14:00 [Bitcoin-development] Combining bloom filters? Jeff Garzik
2013-08-17 14:03 ` bitcoin-list
@ 2013-08-17 14:15 ` Pieter Wuille
1 sibling, 0 replies; 3+ messages in thread
From: Pieter Wuille @ 2013-08-17 14:15 UTC (permalink / raw)
To: Jeff Garzik; +Cc: Bitcoin Dev
[-- Attachment #1: Type: text/plain, Size: 1155 bytes --]
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" <jgarzik@bitpay•com> 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
>
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