I am not quite sure how double-spends are possible at all, but it happened in my Blockchain.info wallet, when I was transferring a minuscule sum between my 2 addresses to consolidate transactions. It was staying as "Unconfirmed" for about a day, then disappeared and then after a few hour a new "Unconfirmed" trans appeared.
Now, it hangs there as unconfirmed, and when I click on it, I get all red:
"Warning! this transaction is a double spend of 83677841. You should be extremely careful when trusting any transactions to/from this sender. "
Here are those transactions:
https://blockchain.info/tx/e84e5f2d72badfaa7d730e03923853073f5493a7153eb58241ef263c573f068chttps://blockchain.info/tx/ac48023657b8dca62e99f6fb643a3e8f513e5fc850eccc2c30404ca80a3ac961Interestingly, I only see the "e84" trans on the address list:
https://blockchain.info/address/1DodoExzsNPvVRXFrgkKw6E259VjfUW8KhNot the "ac4", which is nowhere to be seen.
What should I do about it? Can I cancel that trans somehow? How could it happen in the first place?