Confirmation
Inclusion of a transaction in a block, with later blocks adding confidence that it will remain accepted.
In more detail
On Bitcoin, the block containing your payment gives it one confirmation. Every subsequent block adds another and more work on top of that history. This is why a recipient may wait before treating a payment as settled. Confirmations increase confidence; they don't turn settlement into an absolute guarantee.
How you might use it
'It has three confirmations now.' The payment's block is followed by two more blocks on the accepted Bitcoin chain.
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