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My original plan was to keep them in blockchain as they seem to have very good security, but as their security was not able to stop my 300 coins for getting disappeared, I guess that is out of the question...
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This sounds like FUD to me. If you use a secure password, then access to your bitcoins is encrypted and inaccessible to anyone at blockchain.info or anyone who gains access to blockchain.info's servers. The only places that have access to those bitcoins are the computers where you type the password. This means that either:
- You chose an extremely poor password that a hacker discovered
- or, you typed your password on a computer that was compromised with malware
Do you have any evidence to the contrary?
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As for the hacks, it was not all at once, but over a year,
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Wait. You're saying your account was repeatedly hacked multiple times over a course of a year, and that you continued to use the service each time it was hacked until you had lost a total of 300 BTC?

This doesn't make any sense. It's starting to sound to me like you are sending bitcoins and then forgetting that you sent them.
well, my passwords (rather the ROT(n) versions of them, which i changed)
were "gafa973p3l5h7" to login and "txtxtx18" to withdraw. Granted these may not be award winning passwords, but they are not THAT easy to hack, are they? And the 2nd passwd can only be entered on a virtual keyboard.
Here is the complete list of all warning on my linux, from 'rkhunter'
[19:21:23] Warning: The command '/usr/bin/unhide.rb' has been replaced by a script: /usr/bin/unhide.rb: Ruby script, ASCII text
[19:22:20] Checking if SSH root access is allowed [ Warning ]
[19:22:20] Warning: Hidden directory found: '/etc/.java'
[19:22:20] Warning: Hidden directory found: '/dev/.udev'
[19:22:20] Warning: Hidden file found: /dev/.initramfs: symbolic link to `/run/initramfs'
none of these have the ability to read a virtual keyboard.
As for the multiple hacks, no, not on the samne service
1) BTC-e (and consequently MtGox as I used the same password) (100btc)
2) Bitcoin-24 (government shutdown, but no bitcoins were confiscated... they simply have decided to not return them) (100btc)
3) Blockchain (300btc)
Now, one of many things that is weird about BTC-e is, i always get a "Successful authorization." when I log into BTC-e. But the day I was hacked, there was no such notices... just a "Successful Withdrawl" as midnight, followed by a "Successful auth" from my IP 2 hours later when I logged in, which implies they did not log into my account but came in another way, no?