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book
밑바닥부터 시작하는 비트코인
by
류정필
,
송재준
November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Hanbit Media, Inc.
Content preview from
밑바닥부터 시작하는 비트코인
밑바닥부터 시작하는 비트코인
196
즉 새로운 비트코인이 발행된다는 말입니다. 이를 허용하면 안 되기 때문에 반드시 수수료를
확인하고 값이
0
보다 작으면 트랜잭션은 검증 실패로 폐기됩니다.
NOTE
_
비트코인 오버플로 버그
2010
년에는
1840
억개의새로운비트코인이만들어지게하는트랜잭션이있었습니다.이는
C
++언어로
작성된비트코인코어소프트웨어에서출력의비트코인금액란이부호있는정수(
int
64
)형으로되어있었
기때문입니다.즉비트코인금액으로마이너스값이가능했습니다.
이점을활용한교묘한트랜잭션에서출력의비트코인금액이
int
64
형의최대치를초과하여음숫값으로
인식되었고당시모든검증테스트를통과하여블록체인에포함되었습니다.
2
64
은약~
1
.
84
×
10
19
사토시
이고
1840
억비트코인에해당합니다.수수료는한참마이너스값이지만
C
++코드에서
0
.
51
BTC
로인식
되었습니다.
2
이보안취약점은
CVE
-
2010
-
5139
에서자세히기술되어있습니다.결국비트코인코어
0
.
3
.
11
버전에서
소프트포크를통해정정되었습니다.문제의트랜잭션이포함된블록과그이후의
모든
블록은
소급하여
대체되었고그트랜잭션과이로인해생성된비트코인은결국모두사라지게되었습니다.
7.1.3
서명 확인
아마도 ...
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Publisher Resources
ISBN: 9791162248294