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리퀘스트 키를 사용자가 지정할 수 있도록 변경합니다. 이는 blockchain 과 서비스 (db 등) 양 쪽에서 request key가 저장되어야 할 때 사용됩니다.
리퀘스트 키 미입력 시 자동으로 timestamp가 들어갑니다.