BTC missing after strange negative transaction four years ago I've bought 1 BTC, made wallet.dat file and stored in the cloud. Now I wanted to check balance and after syncing on Bitcoin Core found negative transaction with no address. 





I did not make second transaction. It has no address. What it is? What the second negative transaction means? Why strange icon? Here's second transaction ID 4837f44e4169f287ca6802c45ceab2dfef36ab7d8ecaa0eaebfa59ea6c76e17b



I have 2 public keys. I've tried to dumpprivkey. After obtaining private keys I've tried to import to one local Bitcoin service (spectrocoin) but after 24 hours nothing changed. 

Does it mean that I've lost BTC? Is there anything else I can do? Thank you for your help.
It looks like, using just the 17nu address here: 

https://longhorn.bullpay.com/?gateway=2&amp;data=17nu7oViEtGCYaYwrKKVGyrs7jkcNwpVf2

Only 2 transactions occurred. This transaction:

https://longhorn.bullpay.com/?gateway=2&amp;data=fae9171eea55eb69cbe73f8a23003f9267b71e5a7292d2bcd7b396a58aa82827

Resulted in the UTXO for 1 BTC to 17nu.

That UTXO was then used in this one:

https://longhorn.bullpay.com/?gateway=2&amp;data=4837f44e4169f287ca6802c45ceab2dfef36ab7d8ecaa0eaebfa59ea6c76e17b

But it was combined with other transaction unrelated to the wallet. I'd say your wallet was compromised. Your transactions got bundled in with other UTXO's elsewhere not related to your wallet. 

The address it was sent to: 

https://longhorn.bullpay.com/?gateway=2&amp;data=1NqJgMT4eLPycaD2i7T7xzbd9F9fycWE9u

had a flurry of activity on 5/6/14 within a 2 hour time period. In some cases with massive bundling of UTXO's. 34 inputs, 56 inputs. The transactions moving BTC from that wallet out left it with a zero balance. 

Almost all of this funnels into address 17gH1u6VJwhVD9cWR59jfeinLMzag2GZ43:

https://longhorn.bullpay.com/?gateway=2&amp;data=17gH1u6VJwhVD9cWR59jfeinLMzag2GZ43&amp;grid-page=1

Which processed 17,990 transactions between March 2014 thru October 2014. The entire wallet was left empty with 120,347 BTC passing through it. 

Either this address is used to launder BTC or simple as a convergence point for distribution. Either way this address is tied to a number of google search results in people getting hacked. Eg: https://bitcointalk.org/index.php?topic=754624.0;all

Final answer. You were hacked in some way.

Note: I added all the text in here to show how i traced his BTC from his address to an address known for hacking. This was to demonstrate how i came to the conclusion it was a hack and not an anomaly, software error, bug or something other.