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What is Double Spending? Double Spending Explained - Bitcoin Double Spend - Double Spending ProblemDouble-spending is a problem that arises when transacting digital currency that involves the same tender being spent multiple times. Bitcoin solves these problems by using proof-of-work, the first seen rule of transactions and making consensus the act of nodes receiving a block as opposed to. This 'double-spend' problem is prevented in blockchain-based cryptocurrencies such as Bitcoin by using a consensus mechanism known as proof-of-work (PoW). This.