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The lifecycle of a blockchain transaction begins with the creation of a transaction request by a user. This request includes details such as the sender's address, recipient's address, and the amount of cryptocurrency to be transferred. Once created, the transaction is broadcasted to the network, where it is grouped with other transactions into a block. Miners then compete to validate these transactions by solving complex mathematical puzzles. Upon successful validation, the block is added to the blockchain, and the transaction is considered confirmed. Over time, more blocks are added to the chain, securing the transaction and making it irreversible. This process ensures transparency, security, and immutability, which are hallmarks of blockchain technology.