November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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밑바닥부터 시작하는 비트코인
266
... else:
... version_received = True
➊
version
메시지를 생성하면서
IP
주소 등 여러 필드를 설정하지 않았지만 대부분 노드는
이런 필드를 생략하고 디폴트값으로 메시지를 보낼 수 있습니다.
➋
version
메시지를 보내면서 핸드셰이크를 시작합니다.
➌
verack
혹은
version
메시지를 받아야만
while
루프를 빠져나올 수 있습니다.
➍ 현재 노드가 보낸
version
메시지의 응답인
verack
메시지나 상대 노드의
version
메시
지를 기다립니다. 다만 어느 것이 먼저 수신될지는 알 수 없습니다.
연습문제
10.5
SimpleNode
클래스의
handshake
메서드를 작성하시오.
10.5
블록 헤더 요청
이제 노드와의 통신 링크가 생겼으니 무엇을 해야 할까요? 어떤 노드가 처음 네트워크에 연결
되고 입수해야 하는 가장 중요한 데이터는 블록 헤더입니다. 풀 노드
full
node
의 경우 일단 모든
블록 헤더를 내려받으면 이후 여러 노드에게 비동기적으로 병렬 요청하여 전체 블록을 빠르게
내려받을 수 있습니다. 라이트 노드
light
node
의 경우 블록 헤더를 내려받으면 각 블록의 작업증명
이 올바른지 검증할 수 있습니다.
11
장에서 볼 수 있듯이 라이트 노드는 네트워크를 통해 특정 ...
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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.