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I made a payment to somebody and now he is not replying me regarding the product I made the payment for and think its a fraud. So I want to block the transaction. All I have is the QR code of the person to whom the payment was made. I also have the QR code detail Bitcoin:1PNPnadF26twbAxTZTVeEaQKjbYeXDmeNJ
Sorry, that's not how it works. When you pay with bitcoin, you are essentially paying cash. Since you have the recipient's address, you can look up the transaction on a block explorer like http://blockchain.info, but my guess is is that your transaction already has a few confirmations. You can ask for your money back, but that's it.
– Jestin – 2016-07-22T19:17:29.940Can you help block the address because i am unable to do anything about it. – Balwinder Singh – 2016-07-22T19:41:44.070
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No. That's not how Bitcoin works. I have no more power to do this than you do. Looking at that address (https://blockchain.info/address/1PNPnadF26twbAxTZTVeEaQKjbYeXDmeNJ?filter=2), I can see that there are many transactions to the address. I can also see that all the transactions to that address are confirmed by more than 6 blocks. I don't know which is yours, but it is irreversable. In fact, I can see that all outputs to that address are already spent. Talk to the recipient, because all that can be done is convincing them to send your money back.
– Jestin – 2016-07-22T19:48:31.6033I'm voting to close this question as off-topic because they are asking for help doing the impossible. They have not adequately researched their problem, and are treating this forum like a customer service department for Bitcoin. – Jestin – 2016-07-22T19:56:57.353