Are Bitcoin Zero Confirmation Transactions Safe?

Are Bitcoin Zero Confirmation Transactions Safe?

Transactions are committed to the block chain about every 10 minutes. Zero confirmation transactions do not reside in a block yet. Instead, they reside in the memory pool of miners. Until a block is mined that includes the transaction, it is said to have 'zero confirmations.' Once included in a block and written to the block chain the transaction has one confirmation. Confirmation time is a measurement of a transaction's depth or age, in the block chain; the higher the number of confirmations, the older the transaction. When transactions are first broadcast to the network, they are zero....


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