How are Bitcoin transactions confirmed?
A confirmation occurs when that transaction is included in a block that is added to the Bitcoin Block chain.
A transaction is the exchange of information between parties. That information can be a quantity of Satoshis, tokens or data of some other kind.
When a user wishes to have a transaction confirmed, the complete transaction is broadcast from their wallet to miners in the network who verify that it is valid.
Once validated, miners will decide whether or not to include this transaction in their block template and attempt to mine it.
When a miner discovers a block that includes the transaction, it is considered confirmed. Each time a new block is added to the chain, the transaction is said to be confirmed again with the number of confirmations being the number of blocks added to the ledger that build upon the block containing the transaction.
This generally considered to be a measure of how difficult it would be for a dishonest miner to invalidate the transaction by mining a longer competing chain containing a double spend.
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