G'day, I'm an old fart who's been collecting bitcoin since early 2017. I've got a rough idea how it all works but I still freak out when I have to do transactions so I would appreciate some advice on a strange situation.
Back in September I did a small sample transaction from an exchange to my Ledger Nano S - worked perfectly so I went ahead to transfer the full exchange BTC balance to the Ledger as well.
The transaction status came back cancelled so I just left the balance in the exchange because I couldn't work out what happened?
Today I decided to do the transaction again and this time it worked with no problems.
When I went into the Ledger to make sure it was received I noticed that the exact same amount was also there for the previous transaction..... so it went through twice.
To me it seems like the exchange screwed up somehow but how can that be given the foolproof nature of the blockchain??
Can anybody set me straight on how this shit happens?