Hi,
I usually don't add much fee to transactions, I believe low or no fee transactions are such a great thing about bitcoin. Lately I ordered a lot of digital goods, subscriptions, games, etc online with bitcoin. A coinbase window prompted and I payed the amount (no confirmations required). But after a few days the transactions were still not confirmed. Electrum is the wallet I mainly use. It had problems synching all week now, so I decided to move the remaining funds to a different wallet. (I had to restore the seed everytime I wanted to do a transaction). At some point it wouldn't even connect, reinstalling did not help. So I logged in on my other pc, which also has the electrum wallet on it... and I did not see any transactions. I still had the x amount of bitcoin. So something was not right, I send x bitcoin to my fresh wallet (not electrum), but it did not arrive, the transaction was not even found on the blockexplorer! I managed to sync again on the first pc and did some more transactions. That went fine for a while, then all of a sudden all transactions were gone. Except one, the one sending everything to the fresh wallet. That now has a confirmation. So really odd, these transactions disappearing. My intention was to send the money to a new wallet cause electrum has trouble synching, not to cheat venders out of their money. I did almost one hundred transactions (all low amounts though) in that time, all gone. What are your thoughts on this? Should coinbase ask for a min of 1 confirmation? Does their 0 confirmation policy give me the right to scam them?
tldr; Double spended many transactions during the spam attack (which is currently still going strong)
