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Projects, facilities, services, and gadgets are attracting more people as life speeds up. Blockchain and cryptocurrency systems are trending worldwide. Blockchain interests everyone with technology. They make an interesting transaction medium because they have no single powerful source. Cryptocurrencies are vital financial software platforms. Mining is crucial to its decentralised information ledger dataset. Mining adds transaction data to the chain, a decentralised ledger that lets users securely agree on actions. In 2008, Santoshi Nakamoto tried to use blockchain as a restricted ledger for bitcoin, the most successful cryptocurrency. It's unlike the internet. This chapter will discuss blockchain security, cryptocurrency fraud, cyberattacks, etc. This chapter identifies cryptocurrency blockchain threats and proposes solutions. This chapter reviews and analyses top-cited articles to reach a conclusion. In this chapter …