Confirmation

Confirmation means that a transaction has been processed by the network and is highly unlikely to be reversed. Transactions receive a confirmation when they are included in a block and for each subsequent block. Even a single confirmation can be considered secure for low value transactions, although for larger amounts like 1000 US$, it makes sense to wait for 6 confirmations or more. Each confirmation exponentially decreases the risk of a reversed transaction.

Reference:

https://bitcoin.org/en/vocabulary

A confirmation means that the bitcoin transaction has been verified by the network, through the process known as mining. Once a transaction is confirmed, it cannot be reversed or double spent. Transactions are included in blocks.

Reference:

https://support.blockchain.com/hc/en-us/articles/213276463-Bitcoin-terms-glossary

Refers to an event whereby a transaction has been processed by the network and is highly unlikely to be reversed. When a transaction is successfully entered into a block, it is said to be “confirmed”. This means that more than 51% of the Bitcoin nodes recognize that the transaction is valid and that there has been no attempt to double spend those bitcoins. Transactions receive a confirmation when they are included in a block. Although a single confirmation can be considered secure for low value transactions, it is advisable to wait for 6 confirmations or more. Each confirmation exponentially decreases the risk of a reversed transaction. 6 confirmations are generally enough to make the validy of a transaction beyond question. To protect against double spending, a transaction should not be considered as “confirmed” until a certain number of blocks in the blockchain verify the transaction. The classic Bitcoin client will show a transaction as “n/unconfirmed” until 6 blocks verify the transaction.

Reference:

Malone, J.A (2015). Glossary of Bitcoin Terms and Definitions. United States: Lulu Press, Inc

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