I think you are getting confused. QT is not the same thing as Bitcoin-qt. There is no version 4.8.3 of Bitcoin Core (formerly known as bitcoin-qt). Qt is a library made by Nokia that bitcoin core uses and comes bundled with and its version is 4.8.3. you need to upgrade to the latest version of bitcoin Core, which is 0.11.2. you can download it here https://bitcoin.org/en/download

You can try using this software to search your drive for deleted files. The more you use the PC since deleting the wallet file the less likely you'll be able to recover it with this. but It's probably too late now as you've done a reinstall, but give it a go anyway.

https://www.piriform.com/recuva

Your wallet file is your BTC, BTC is like a digital item. There is nobody who can help you if you lose your wallet.

This isn't something that is new to Windows 10 and has been known about for years. In fact Microsoft state this on their website, it is a "feature" of BitLocker encryption. If you're worried about this then don't use BitLocker. Also Bitlocker is not activated by default, perhaps it is on new Windows 10 machines that you buy, but I did a fresh Win10 install and Bitlocker is disabled and I was never prompted to enable it.


By not generating truly random numbers.

He left me negative feedback too for replying to this thread, he also left 10~ PayPal BTC traders negative trust too.

He's not on defaulttrust so the feedback does not really matter. Don't worry about that so much as there isn't much you can do unless he removes it himself. There are lots of people who have had similar things happen to them and it doesn't affect their ability to trade at all.

He's a troll, just read some his posts. . He's doing this to get a reaction out of you, he finds it entertaining. I'd recommend just ignoring him, if he keeps harassing you keep reporting him to mods. I can't understand why he hasn't been banned, I guess he is careful not to troll the wrong people or say something blatantly illegal.

I completely disagree. Coinbase has had lots of security vulnerabilities in the past that were disclosed to them. In almost all cases they either failed to properly fix the issues and/or pay those who reported them. Some hackers who weren't paid said that in future they would not be disclosing any issues to coinbase and would use the issues to steal the BTC because they won't pay them. They have been very lucky because they could've been cleaned out many times in the past but the hackers didn't do it thinking that coinbase would give them a reward instead, but coinbase rarely did that even though they have made promises to do so.

About the insurance, BitPay also had insurance and when they were hacked for $1.8 million the insurance company didn't pay out due to a technicality. So you can't really count on that.

http://seclists.org/fulldisclosure/2014/Dec/28

http://www.newsbtc.com/2015/12/21/unbelievable-bitcoin-exchange-coinbase-bans-user-who-helped-saved-millions/

http://www.newsbtc.com/2015/12/22/bitcoin-exchange-coinbase-comes-clean-on-bounty-controversy

http://www.coindesk.com/bitpay-sues-insurer-after-losing-1-8-million-in-phishing-attack/

I don't really see the point, why not just generate a private key and give that to the recipient? Why should we have some site holding the Bitcoins, that's a lot of unnecessary risk.

You should just lock the thread. You posted a question and got your answer, no point feeding the trolls.

Lol, I suppose there was no point crying over spilt milk.

Some people have had success playing dumb. If it was me I'd say it was money from friends and if they question you tell them the Bitcoin community are your friends In any case I'd recommend responding ASAP even if you tell them you were breaking the rules. You will get your money back after 6 months but every day you don't respond delays it.

Wrong section. Bitcoin or other currency trading is not allowed by PayPal, so don't mention that. Were the payments sent as gifts? you could claim these payments are from friends and family, if that doesn't work you'll be allowed withdraw your balance after 6 months but now that your account is limited its most likely going to be permanently closed.

The speed of the RAM is not so important more than the amount. Using a different OS wont make a huge difference either as it's bitcoind that needs the RAM, the OS will only use a tiny part of what bitcoind uses.

If you don't need a GUI go for Ubuntu server over Ubuntu desktop. 2GB RAM is too little, the server version uses around 150MB RAM vs atleast 500MB RAM for desktop one, but even still you're cutting it close with 2GB, you'll start running into problems as the blockchain grows.

theoreticals* and hardware hacking is not theory, its been done just not in the Bitcoin space yet... as far as we know.

Right but which is more likely to have Bitcoin stealing malware, a chip in a Dell PC or a chip in a device designed to store bitcoins? I would think that the hardware wallets are the ones most likely to be targeted by this sort of thing. Also hardware wallets are much simpler devices which makes this sort of thing a bit easier.

If there was a hardware wallet with a backdoor it would be unlikely anyone would have found it. I don't think there are many publicly known techniques for detecting this sort of thing other than dipping the chip in acid and using an electron microscope. Certainly there have been many Bitcoins stolen from hardware wallets where the owners claim not to know why but its more likely those thefts were due to user error rather than a backdoor. What is certain is that hackers will try this as there are many hackers out there capable of these kinds of attacks and the incentive is definitely there. You must trust the manufacturer of any computer you use to store Bitcoins, whether it be a general purpose PC or a hardware wallet. If you use a hardware wallet you are still putting significant trust into the hands of the manufacturer and anyone who tries to say otherwise is completely wrong.

Actually you are the one who needs to do more research. Yes you are right the software that runs on it is mostly open source (no hardware wallet released so far is actually 100% open source, some have 99% of the code open source like the trezor but most don't have any part of the hardware open sourced, none of the ones you have linked are 100% code and hardware open source), however there are still many other worries. One thing that scares me a lot is that trezor hard an onboard RNG chip that is not open source and was completely designed and manufactured by a third party vendor, however it doesn't use this chip exclusively it combines it with random data from your PC so unless both are colluding you are safe. First of all unless you actually build the software from source and load it onto the device yourself how can you know what is running on it. How do you know that the device hasn't got some extra code that generates non random seed words, or even more hard to detect - non random R values, similar to the bug in blockchain.info before, or even code that transmits the seed words hidden in inside the tx data allowing the attacker to retrieve them from the blockchain after you push a tx. Even if you do load the code yourself it is still possible that some chip on the device is the thing that is backdoored and able to execute these kinds of attacks, this is called "hardware hacking". This is near impossible to detect. The US military has invested billions into trying to solve this problem and are able to detect backdoored chips by destructive testing by means that are not yet public however we do know that the chip is useless afterwards, so when they need to source chips from China or such they buy lots of chips and destroy 80% of them and if they find no backdoors they decide the remaining 20% are safe enough and those are the ones that end up in black hawk helicopters and other important things. So tl;dr; It is really hard to be sure your hardware wallet isn't backdoored. Unless you build it from bare silicon yourself there is trust involved.

I would estimate a few cents worth per century. If you want to mine Bitcoins you really need an ASIC, but even still it's not really worth it unless you have millions ready to invest in a country with low electricity rates.

One potential issue is you have to trust that the trezor itself doesn't have some kind of backdoor built into it. Even though the device is mostly open source it is still very easy to hide hard-to-detect backdoors in it. I believe trezor's ship with some kind of tamper proofing so that you can tell if it has been tampered with during shipping, but maybe a rogue employee worked on your trezor and hid a backdoor which he could use to steal your Bitcoins sometime in the future, or maybe even a hacker has compromised some computer involved in the manufacturing process and used it to backdoor your trezor. It all comes down to trust really, if you trust the trezor guys to do their job right then you don't have to worry about this, but that's kind of difficult to do isn't it.

Find your wallet.dat file and import it to blockchain.info here https://blockchain.info/wallet/import-wallet

Your wallet file will be in ~/.bitcoin on Linux and somewhere in AppData on Windows IIRC