Sent BTC to Coinbase and the transaction shows 2 amounts & I only received 1

[BTCminer]

So I transferred a small amount of BTC from my Trezor Model One to my Coinbase account.

The original amount was transferred ok but a second much larger amount was generated and is listed in the transaction.

I have no idea what is going on? What is this second amount? How was it generated? I didn’t authorise anything other than the first amount.

Have I been hacked?

I contacted Coinbase and they said it was nothing to do with them.

I’m very confused by this and also I can’t contact Trezor support direct for this issue even though I’m a paying customer of theirs.

Please can anybody help on this?

My problem seems to be the same as this ID?: Ticket ID: 122010

[forgi]

it is a change address, not an issue, explained here:

Bitcoin Change Addresses

I was reading about Change Addresses in Bitcoin transactions and found some explanation in the Trezor Wiki and in the Bitcoin Wiki. I also found an explanation of Change Addresses on BitPay. So I think I understand what a change address is, what changes are, and that it’s change (money) returning to the sender after a Send transaction if the total amount sent was larger than asked for (just like you’d get back change from the cashier on a $20 bill in a shop, if the item you bought costed less t…