Quote from: kahc on December 09, 2017, 12:09:30 AM

Quote from: kcsunshine on December 08, 2017, 11:51:47 PM

Can someone please explain what happened here exactly please? The below transaction was initiated with a fee per of 143 satoshis per byte, and it is showing unspent on the blockchain, but apparently the sender said that it came back to him. How could this possibly be???

txid
https://blockchain.info/tx/996520ceda3521cc1ca410a70d81bda6fa214413b8922ea0592e60f45db7be84?show_adv=true

address
https://blockchain.info/address/13Y46QiUbbqEZhHWgHdHUJpt8PrEfz8qTk

As seen here https://blockchain.info/address/1GRGJdVCv3nFoUHgducFwiVsUWzmfz864E , he double-spend to another address(3Q1FLQFfbsXsF4VfPjwYkbHhfxLSaqxjRA) with a higher fee.

So the transaction to your address 13Y46QiUbbqEZhHWgHdHUJpt8PrEfz8qTk will soon disappear or be marked as "double-spend".

When someone is sending me bitcoin then, how do I detect a double spend before the transaction to me is confirmed??

UPDATE:

Wait a minute. The transaction you show there that is confirmed, happened a day later. So I ask again (please no offense), How is it that the first transaction I show was sent back please. Look at the dates.