So there really isn't another layer of security? If I compare thousands of hashes in a day to the entire blockchain you're telling me that I won't ever find a match in a Week, a Month - a Year? With a super computer? Cheers

Well, math and the laws of physics are against you...
This image is never going to get old.




The keys are not stored in the chain. The blockchain is a ledger of the transactions.
I recommend you start reading https://en.bitcoin.it/wiki/Main_Page before you waste your life searching for a match.


One trillion is just a puny 2^40,  think more of 2^96 when you try to match private keys.

Without breaking down into a pure Mathematics post, just look at this using simple logic.  If you have a BTC address in a wallet (example Electrum) go ahead and bring up the private key for that address.  Now observe how long and highly scrambled it is.  Now just picture that you would EVER be able to randomly generate that number in your lifetime, remembering that as you generate your random keys you have to also use them to perform an analysis if there is a match out there.  While possible in theory it would more likely be lifetimes without ever getting a "hit".

hey!! this occupation is completely useless, try to find to the key to the particular Bitcoin purse. If you are not the hacker and somebody  you are interested in, doesnt keep his privat keys of BTC wallet on the desktop. It is just waist of time.

okay - So go back to the 12 word phrase thingy if you please,
Why can't I just attempt to restore thousands of times with various 12 words from the dictionary? I bet I would find something in a couple days, I might be wrong, But they just ask you for 12 words.. no address or anything? cheers for useful replies people

Also - If I sign up with the wallet hundred times I might see that some words appear more than others as a basis to start from - or just use the words given to me on my 100 accounts to hopefully crack some others?

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Also #2 : Back to Bitcoin - It is true right that I can restore my wallet (whatever that means) from my Private key? I mean that's just one private key. So is it JUST down to possibility? Everyday that possibility gets less as more people join and more keys are made, I have bigger chance of Hitting a wallet with a random key? Is that correct or am I missing something.. I mean the 'keys' must be 'stored' somewhere? Otherwise what allows me to restore my wallet? Cheers

Maybe you could explain a bit more from this point please Pal?

Understand! Not just this whole system was created and exists as a decentralized cloud. For 7 years of the existence of bitcoin, not one person thought about the possibility of hacking. Such people even have a profession - hackers. And they definitely do not think as banal as the described process in this topic. Do not make others laugh.

all is about the private keys that help prevent loss of funds and other mishaps.
anny valid transaction bearing a valid signature will be accepted by the Bitcoin network. so any person in possession of a private key can create a valid transaction in bitcoin chain.
 and note well that someone knowing only your private key can steal from you.

If your bitcoin does not put in a safe place, then the hacker will be easy to steal your bitcoin, there are many cases that have occurred. I feel bitcoin can still be stolen by irresponsible people. In fact I personally have experienced it on my blockchain account. I installed a bitcoin game app and after 24 hours my email went off saying it asked for login verification in blockchain. I am still saved because I have secured my account well.

The first reason I think is bitcoin is a virtual currency which there is no physical substance that subject in snatchers.
All IT experts and hackers are has capacity to steal this virtual currencies, unfortunately the company of bitcoin provides a high security to block this threats may happen.