issue #120 관련. yg-amazon-exp branch 정리를 위한 cherry-picking #121
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#120 에 나온것과 같이, stale branch인 yg-amazon-exp를 정리하는 과정에서, 하나의 commit만을 히스토리로 남기기위해 master로 cherry-picking하였다.
해당 커밋은 BLEEP lib로 PoW node를 만들어 아마존에서 동작시킬때, 예기치 않은 오류를 방지하기 위한 fix이다.