Quote from: piloder on November 19, 2016, 04:52:48 PM

Quote from: OmegaStarScream on November 19, 2016, 04:32:30 PM

If by importing the wallet.dat (private keys) means swapping them to other private keys on blockchain.info servers then the imported wallet will be useless but If someone puts his hands on the wallet.dat on the servers on blockchain then cracking it would be possible. wallet.dat contains a lot of information's[1][2][3] and there is some tools to read them[4] so I assume It's possible to read the addresses + balance without the need of cracking it, after having the addresses that contains a lot of BTC , the cracking begins process begins.

[1] https://en.bitcoin.it/wiki/Wallet
[2] http://bitcoin.stackexchange.com/questions/3173/what-information-does-a-wallet-contain
[3] http://bitcoin.stackexchange.com/questions/853/what-do-the-different-dat-files-contain/854#854
[4] https://github.com/jackjack-jj/pywallet

Thanks for info, i was already frighten from blockchain few months ago when they announce that their dns server got changed from their domain registrar account which i don't think can be possible without someone else hacking it.

So paper wallet and hard ware wallet are good choice or what about electrum? I think it doesn't have any server where they store wallet info.

Thanks for all infos @OmegaStarScream, really useful!

I believe that paper wallets are the most secure way to store bitcoins if you have big amounts and want to hold it for a good time also you can make 1 wallet for every bitcoin for example and have more security.