November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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밑바닥부터 시작하는 비트코인
306
그림
12-3
2
개의 원소와
2
개의 해시함수가 있는
10
비트 블룸 필터
블룸 필터는 원하는 오탐지율을 얻도록 해시함수의 수와 비트 필드 크기를 최적화할 수 있습
니다.
4
12.2
BIP0037
블룸 필터
핸드셰이크를 마친 노드사이에 트랜잭션을 전송하기에 앞서 블룸 필터를 설정하는 방법은
BIP0037
에서 제안됐습니다. 블룸 필터를 정의하는 정보는 다음과 같습니다.
1
. 비트 필드의 길이, 혹은 분류되는 그룹의 개수 (여기서 길이는 바이트 단위로 설정되며
필요 시 반올림됩니다. )
2
. 해시함수의 개수
3
. 오탐지율에 영향을 주는
tweak
파라미터
4
. 설계된 블룸 필터의 비트 필드 값
4
블룸 필터를 통해 동일한 그룹에 속하는 원소(본문에서는
Hello
World
와
Goodbye
) 외 다른 원소가 이 그룹에 속할 때 다른 원소가 오
탐지(
false
positive
detection
)되었다고 한다. 즉, 같은 그룹에 속하도록 의도하지 않은 원소가 같은 그룹으로 판단될 때를 말한다. 비
트코인에서는 이러한 블룸 필터의 오탐지 특성을 역으로 활용하여 관심 트랜잭션을 오탐지되는 트랜잭션 안에 숨기는 데 사용한다. 오탐
지율(
false
-
positive
rate
)이 높아지면 그룹 안의 트랜잭션 수가 많아지면서 관심 트랜잭션 비율이 낮아지고, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.