Quote from: LoyceV on December 09, 2017, 08:25:10 AM

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

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

It's not even a double spend, it was never spend to TS.
If it's a double spend, blockchain.info shows a big warning. Now it shows this:
https://s18.postimg.org/daus8sk21/gif.gif
Note the negative Final Balance.

Blockchain.info has bugs: it is possible to create "transactions" that only show up on blockchain.info. I've seen it before. I don't know how they do it, it seems they only broadcast it to blockchain.info and not to other nodes. This typically shows a negative balance on the address, which obviously shouldn't be possible.
If you try to find the transaction in any other block explorer, it doesn't exist.
I don't know why blockchain.info doesn't fix this, it's abused by scammers a lot.

Quote from: kcsunshine on December 09, 2017, 01:17:09 AM

So I do I detect from the beggining that a user is trying to rip me off??? How do I know he didn't send those funds to two wallets at the same time or something??? I need to know this because Ido a lot of bitcoin transactions.

This scam could have been seen by checking another block explorer, or probably your own wallet too. I'm pretty sure this one didn't show up in your own wallet yet.
Satoshi recommends to wait for 6 confirmations before trusting a transaction. Unless you're dealing with very high amounts, I'd take 1 confirmation as enough.

Very interesting.

To provide insite to this thread, I will add that the transaction was sent from a coinomi wallet, and if I am correct, they use shapeshift. Scary. Lesson learned here. Use more than one block explorer to check tx.

This transaction looked perfectly normal especially right after it was transmitted, because the negative balance did not show up until the next day!!! One would have assumed that this would have eventually confirmed, but it was never going to!!!

If you have anymore comments as to what i added it would be appreciated, and thanks for your valuable input.