Hacked bitcoin account.

I believe that my account was hacked: a “send” transaction occurred on my account an hour ago and I lost $62 without my raising any transaction. The transaction is still unconfirmed, how do reverse it and get my money back ? Standing by.
Recipient address-https://blockchain.info/address/18VhGJQgvYVpGLfZPJ1wu85JDAJ8UU6A62
Transaction hash code – https://blockchain.info/tx/ae97308ffd3e460ec4d928d5309479351220b30811d7e02f2a571e23d38e48d2

Once more, I did not make this transaction,and $62 disappeared from my account. Please help.

What is an obfuscation key?

This message appears in my debug.log:

2017-01-21 00:16:42 Opened LevelDB successfully
2017-01-21 00:16:42 Using obfuscation key for /home/<username>/.bitcoin/blocks/index: 0000000000000000

As does this:

2017-01-21 00:16:42 Opened LevelDB successfully
2017-01-21 00:16:42 Using obfuscation key for /home/<username>/.bitcoin/chainstate: <removed>

What is an obfuscation key used for?

Blockchain use in Record Management

From my understanding of blockchain, I feel the main use of blockchain is to do something in a decentralised way as compared to the traditional centralised way which involves a middle man. Usually, the centralised way is a much simpler way, but use of a more complicated way (blockchain) becomes justified because you are able to decentralise.it.

However, I see a lot of companies which are currently the central party trying to get into Blockchains. For e.g. banks etc. I am not sure what advantage there is here.

For example, take a look at this – ironmountain.com – What-is-blockchain-and-why-should-records-management-professionals-care

In my opinion, regular PKI is best suited for this. A user signs his document with his private key & then submits it to Iron Mountain. This will ensure integrity. So what advantage is it to either Iron Mountain or the user if Blockchain is adopted in this case.

It also seems as if Blockchain is getting forced into places where it’s not necessarily the best solution.

Or am I wrong?