Quote from: ThomasAnderson7 on January 01, 2017, 03:36:22 PM

Some things are not still clear.
How can I create a offline wallet if the PC with the offline wallet will not be ever connected to the internet?

You have to download the software on an online computer, verify the software, move it to a USB drive, and then install the software from the USB drive to your offline computer.

Quote from: ThomasAnderson7 on January 01, 2017, 03:36:22 PM

So, to create a "offline" (?) wallet I take this Netbook or Raspberry PI 3, connect to internet once, create an 2Factor Authentication wallet Bitcoin, backup seeds on a paper, exporte private keys on a safe crypted USB (right, or I don't need to backup exported private keys?), then I send Bitcoins from Blockchain. info to Electrum address, then I'm 100% sure?

No. You do not ever need to be online to create Bitcoin addresses. There is no need to create an account anywhere, you don't need to do that.

Quote from: ThomasAnderson7 on January 01, 2017, 03:36:22 PM

I still don't understand how can be offline if I create it online, this concept is not clear, I mean, the Bitcoin are saved on the PC itself, so can't be stolen if I'm cautious?

There is no such thing as a Bitcoin that is saved. All that you need are the private keys.

Quote from: ThomasAnderson7 on January 01, 2017, 03:36:22 PM

I can connect it to the internet btw once in a while,

No. That defeats the purpose of an offline wallet.

Quote from: ThomasAnderson7 on January 01, 2017, 03:36:22 PM

I'm safe here, but I wanna be 100% sure that Electrum and other sites do not own my bitcoins like online wallet do

Desktop wallet software means that the people who made the software have absolutely no control over your Bitcoin.

Quote from: ThomasAnderson7 on January 01, 2017, 03:36:22 PM

And I only need seeds, not private keys?

You need the private keys, but with HD (Heirarchical Deterministic) wallets, you have some sort of master private key from which all of your private keys are derived from. That master private key can take the form of a seed mnemonic.

Quote from: ThomasAnderson7 on January 01, 2017, 03:36:22 PM

For example, if I lose everything to access my wallet, keys (still don't know if I have to backup and don't know how they work Sad

), PC, Google Authenticator, literally everything except for the 12 words, and 10 years after I decide to restore my wallet with the 12 words, can I do that, right? I mean, so, I only need those 12 words and I'm 100% safe that I can restore my bitcoin in future or immediately

So long as there is software that supports that type of mnemonic and the same derivation process, then yes.

Quote from: Rupucers on January 01, 2017, 04:04:02 PM

Also what is better Electrum or Armory as offline wallet?

Depends on your use case. If you want privacy when spending, then you should use Armory. If you want ease of use, then Electrum. Electrum supports the BIP 32 HD Wallet standard whilst Armory does not (it still uses an HD wallet though).