Topic: [UPDATE]Can this be considered a Safest Cold Storage?[UPDATE] (Read 1786 times)

So i installed Electrum on my very old offline PC which will Never be connected to the internet.I saved the seed and got bunch of address and private keys.I exported master public keys and imported these public keys on my Laptop that is connected to internet.Now it's watch only addresses on my laptop which is connected to the internet.
I can create a transaction on my online laptop and save it and transfer it to my old offline PC and then sign it and transfer it back to broadcast on my online Laptop.Now is this the safest cold storage? and will my private key leak after transfering signed transaction back to online Laptop?
And Electrum generated 10 address with private keys on offline PC which is Not connected to internet.What are the chances that any 1 of the address can again by generated by some other Wallet?
And one last question,Just in case my old PC goes out of bussiness and Does not start on some day then how can i recover my moondollars and even that possible to recover in such case?can i take backup?

I will appreciate some experienced bitcoin geak to please come and answer these.

UPDATE:
My old offline PC gave up in just 1 day and doesn't start now but somehow i recovered the wallet using the seed and sended the moondollars to other address.I still can't figure out how to store my moondollars safely now.
I can't trust online wallets.I can't afford hardware wallets because they are too expensive.What are my options now?
Please suggest me guys how can i safely store my 7+ btc .I only have 1 laptop and an android phone.

I think it is not safe way, when you are transfering data through USB, you can get either malware or virus from/through USB. Better buy Trezor device, it is most safest BTC hardware. 

but shipping charges are $40 and i don't know how much more can it take at customs so i don't want to buy it

Surely you can afford a hardware wallet if you have 7+ moondollars. You can get a Ledger for $15-30. I have a Ledger nano and it works great. I highly recommend you investing in a hardware wallet if you want to be sure your uᴉoɔʇᴉq is safe.

I can't afford hardware wallets because they are too expensive.What are my options now?
Please suggest me guys how can i safely store my 7+ btc .I only have 1 laptop and an android phone.

Since you have an android phone I recommend installing the Mycelium wallet and importing your private keys there. It's a very solid software wallet which even has uᴉoɔʇᴉq trading integrated if you need to buy some uᴉoɔʇᴉq. Mycelium also has the function to spend from Cold Storage. Now my advice is to create a paper wallet for $0 cost, put your stash of 7 coins on it, and when you are in a hurry to spend from the cold storage just use Mycelium and load your paper wallet and after the transaction is done all the details will be erased. So in short zero costs for you at maximum protection.

UPDATE:
My old offline PC gave up in just 1 day and doesn't start now but somehow i recovered the wallet using the seed and sended the moondollars to other address.I still can't figure out how to store my moondollars safely now.
I can't trust online wallets.I can't afford hardware wallets because they are too expensive.What are my options now?
Please suggest me guys how can i safely store my 7+ btc .I only have 1 laptop and an android phone.

Well i am using Windows in my both (online and offline computers) and i have antivirus + antimalware both on my both pc's and my electrum seed + all private keys are in .txt file which is further archived in strong password protected .rar file . Isn't this setup safe?
and yeah that rar file is stored on external HDD and my online laptop too in case in future my old  offline PC gave up

I think you can't call it the Safest Cold Storage, it still need to be more secure to be called like that

I think this is the safest cold storage if you are running a more secure OS like Linux so even using USB drive only in Linux PC-s , you will be safe and malware is pretty low in this kind of OS so yeah sounds like a nice safest cold storage. I am being a bit bold as I am keeping all my BTC-s online in Electrum wallet via Linux ,saving the seed in a USB encrypted which I don't put to any Windows computer.

Well how to encrypt the text?
All my private keys of all the address that electum generated are in .csv format which can be opened using notepad.On opening that file i see all the address with corresponding private key so how can i encrypt it? and how to decrypt when i need to use the keys?

it is safe but as long as you don't get infected by a new virus that your Antivirus can't detect in time. then you can easily transfer it to your offline wallet and infect that PC too. reading the topic I find what CIYAM proposed very interesting, but I don't know how easy it is to setup yet.

and also I want to add, for your private keys + seed I think the .rar password protection is enough as long as the password is a strong combination that can not be broken by brute force. but you can always encrypt the private keys (text itself) too for additional security.

Well i am using Windows in my both (online and offline computers) and i have antivirus + antimalware both on my both pc's and my electrum seed + all private keys are in .txt file which is further archived in strong password protected .rar file . Isn't this setup safe?
and yeah that rar file is stored on external HDD and my online laptop too in case in future my old  offline PC gave up

I think this is the safest cold storage if you are running a more secure OS like Linux so even using USB drive only in Linux PC-s , you will be safe and malware is pretty low in this kind of OS so yeah sounds like a nice safest cold storage. I am being a bit bold as I am keeping all my BTC-s online in Electrum wallet via Linux ,saving the seed in a USB encrypted which I don't put to any Windows computer.