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This paper examines the current state of cryptocurrency forensics focusing on digital forensics investigation supporting law enforcement activities. We begin with a brief overview of cryptocurrency and blockchain technologies, and with that understanding, we explore criminal and malicious activities enabled by these technologies which drive the need for cryptocurrency forensics. Followed by this, the paper will explore current cryptocurrency forensics techniques and challenges pertaining to mobile forensics, computer & memory forensics, and blockchain & network forensics. We will analyze the current body of research and identify gaps in the area. Also, current researchers and practicing investigators indicate that cryptocurrency forensics seems to be lagging and needs improved inter-agency coordination along with forensic techniques to counter the existing and emerging threats.