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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.