• The possibility of a cryptocurrency being used twice or more is known as double-spending. If certain criteria are met, transaction information on a blockchain can be changed. If the prerequisites are met, updated blocks can be added to the blockchain, and the person who made the change can regain spent coins.
• When someone modifies a blockchain network and inserts a special one that allows them to reclaim a cryptocurrency, this is known as double-spending.
• Double-spending is possible, but it's more likely that a coin is taken from an unprotected and safe wallet.
• For double-spending, a variety of methods could be used—51 percent is one of the most widely stated, but the unconfirmed transaction attack is the most popular.

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