November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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밑바닥부터 시작하는 비트코인
250
부터 해시값이 더 작은 값임을 알 수 있습니다.
TG: 0000000000000000013ce9000000000000000000000000000000000000000000
ID: 0000000000000000007e9e4c586439b0cdbe13b1370bdd9435d76a644d047523
연습문제
9.9
helper
.
py
파일의
bits
_
to
_
target
함수를 작성하시오.
9.3.3
난이도
목푯값의 수치만으로는 이 값보다 작은 해시값을 얻는 것이 얼마나 어려운지 가늠하기가 쉽지
않습니다. 목푯값은 숫자이고 사람은 숫자의 자릿수가 길면 수의 크고 작음을 간파하는 것이
쉽지 않기 때문입니다.
180
비트 수는
190
비트 수보다 수천 배 더 작지만 이들이 목푯값이라고
할 때 많은 자릿수 때문에 해시값을 구하기 어려운 정도를 가늠하기 쉽지 않습니다.
서로 다른 목푯값을 쉽게 비교할 수 있도록 난이도
difficulty
라는 개념이 탄생했습니다. 난이도 목
푯값이 작다는 것은 해시값을 구하기 어려울 것이기에 난이도를 목푯값에 반비례하도록 정의
하면 서로 다른 난이도 사이의 비교가 쉬울 것입니다. 계산 수식은 다음과 같습니다.
4
difficulty
=
0xffff
×
256
0x1d
-
3
/
target
난이도를 계산하는 코드는 아래와 같습니다. ...
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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.