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After sending Bitcoin to any address, how can I check if the transaction has at least one confirmation?

Should I poll the transaction repeatedly or is there any event when confirmation is made.

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    What software, service, or API are you talking about? – Pieter Wuille Oct 31 '18 at 6:50
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In order to see if the transaction has confirmed, you can search for it in any indexed transaction database. This can include Bitcoin Core running in -txindex mode, or a block explorer such as live.blockcypher.com or blockchain.info, for example. As soon as the transaction has been included in a block, it has 1 confirmation. If it is not found, or is still in the mempool, then it has either not propagated (failed validation checks), or has yet to be mined.

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