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I made a double payment to the same address mistakenly since my internet was a bit slow, and one payment has 8 confirmations. The recipient says he hasn't received it. I got this message from the transaction:
A conflicting transaction has been detected in our memory pool. The transaction hash displayed below may change.
What can I do to resolve this?
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A double spend is not possible. A double spend attempt, yes. You might try and (accidentally or intentionally) broadcast two different transactions that spend the same bitcoins. But only one will eventually get included in a block.
If you say one payment has 8 confirmations, then that's the one that became final ('set in stone') and the other will never happen.
a double spent is possible. with altering the mainchain from some past block – amaclin – 2016-03-30T20:06:14.423
yes, but it is highly unlikely that someone has right now the ability to mine 8 blocks before there are any new blocks. – galileopy – 2016-03-30T20:11:14.377
@amaclin That's extremely unlikely, but even if someone pulls it off, the earlier transaction no longer exists. So eventually, that first spend never took place. – RocketNuts – 2016-03-31T09:48:38.633
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The recipient says he hasn't received it.
Show him this transaction on any blockexplorer site
E.g. on blockchain.info
2I don't think you need to do anything. Since the transactions conflict, the second one will never confirm. – David Schwartz – 2015-10-02T08:25:15.693