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These blocks are used to record all transactions made on the bitcoin network, and have a maximum size of 1 megabyte (MB meaning they can record just seven transactions per second at most. The only way I know to defend against the original transaction ever completing is to spend those bitcoins a second time (e.g., in a transfer to yourself at a different wallet). . The problem was flagged up last August by one of the main developers of bitcoin over the last five years, Gavin Andresen, who told. Bitcoin has failed because the community has failed, Hearn said. . This is insane, and could lead to losses.
However this protection starts to wear off after 1-2 days, where the site will be able to spend it again. Transaction expiration is a common myth/misconception. Bitcoin transaction is created, it never automatically expires. In theory, a transaction could be created, get stuck at 0 confirmations for some years, and then all of a sudden confirm.