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How miner validates each transaction? Does he have all the information of the transaction taking place between nodes?

Thank you.

Mansi Goel
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  • I'm not sure I understood the first part of the question. What do you mean 'all the details' of a transaction? In Bitcoin technology the transaction is a chunk o data with all information, so all the details of a transaction is the very transaction itself. – Osias Jota Mar 06 '18 at 17:19

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Miners role is not to validate transactions, but to confirm them. Every node validate every transaction every time. A single invalid transaction would invalidate the entire blockchain.

In Bitcoin technology the transaction is collection of bytes. All the information about a transaction is the very transaction itself.

Osias Jota
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  • For eg. If A wants to give 5 bitcoin (for an instance) to B and A has only 3 bitcoin with him. In this case how this invalid transaction would be invalidated by other nodes? And here another question arises how blockchain helps to prevent duplication of bitcoins? And also if the transaction is validated by other nodes then why there is a need of miner to confirm those same transaction? – Mansi Goel Mar 07 '18 at 04:23
  • If A wants to spend more bitcoins he has, he will setup this invalid transaction in his computer. So he'll send that transaction to another computer running bitcoin. That computer will read the transaction received via the internet, see it's invalid (spend more than it can) and delete it from its memory.

    No other node will accept or relay invalid transactions.

    Your third question is the answer to the second one: miners confirm transactions to prevent duplication of spending. Read more here: https://bitcoin.stackexchange.com/questions/148/what-exactly-is-mining

     – Osias Jota Mar 07 '18 at 12:00