This is worth reading:
It's always been like that, QC connected to a normal computer to "work"... now:
A simulation conducted using normal computers; it may impress investors (their target market) but not most of the community.
I'd say that the "light" to the future of QC is too dim to be a threat. That's even an article released on 3 Sept 19.

So, this "quantum computing" thing was based on string theory which is mathematically credible but still "not science".
Basically, you need to break the laws of physics to hack a system that breaks the law of physics... hmm, it's not wrong.

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A classic supercomputer that can break secp256k1 which can lead to stolen UTXO with "exposed public key" like the #1 in figmentofmyass' list
is more of a reality and maybe just a few years away.

<typo>

Let me guess: you've read the title said "holds private keys", then you came up with this post.

Private keys aren't passwords, you don't "hold" them in a list lest memorize them all (Is that even possible?).
"Everyone" shouldn't hodl private keys like it's his account number, it shouldn't be displayed at all unless necessary.
Except if you're planning to sweep the funds to another wallet or for making a paper wallet.

You can memorize the Mnemonic SEED phrase (if your wallet have one) where your private keys were derived
but not each of the private keys of your addresses.

Keep your wallet encrypted, in a secure storage and device (also your SEED in a piece of paper); that's where your private keys should be.

Yes if the [1]  Server seed hash was given in advance in every bet (check the casino's provably fair link for "Seeds for your next roll" or something similar). and if you can confirm it using the instructions in my previous posts.

But there's no guarantee that the casino will be honest with every bet specially for Auto Betting where the gambler wont have any opportunity to check the server seed hash & change his client seed before every bet.
But again, if the gambler is betting like a responsible member of society, he will have the chance to confirm each bet, thus, making "provably fair" notion equal to "provably scam free".

[1] The one that's being sent by the server to the client in advance is the Server Seed Hash.
The Client Seed was randomly generated through the browser or through a script.

@GreatArkansas Read this post's second paragraph...
Yes, but I think casinos won't take the risk of doing something like that unless they are a scammer to begin with
because if they do, the chance that they will get caught in the first day alone is too high.

The cost? Depending on the Coder.
Go to Services (if you're paying with Bitcoins) and see if there's someone with positive rating is willing make you a script.

If you're planning to use something like the code in the link,
you're going to need to a full node with wallet.dat containing all of your pre-generated private keys (importing them will be time consuming)
You can ask and trust the programmer to make a .txt containing all the prv keys and use a command to be able to import them in one go (example) or do it yourself if you don't wan't to show him the keys;

and Ubuntu running on a decent spec PC.

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I just need to tell you that those 1mil randomly generated private keys doesn't have a reasonable chance to hit a collision.

Whether if it's new or old time-tested casino,
If the result from my post above (#2) was correct for every bet, then the site that cited that they are "provably fair" is really scam free.

Why? [1] If the Server SEED Hash which was given to the client in advance, was really the hash of the Server SEED,
then it means that they didn't changed it, thus they didn't tamper with the result(s).
Although investigators need to check each bet because each have different set of server seeds.

[2] The player can change the Client SEED to his liking which will alter the result,
but the player can't cheat the casino either since the Server SEED was "encrypted" (not really encrypted but hashed) before he make the roll.
That's the reason why it was encrypted at first, but it's verifiable if it's really the hash of the Server Seed for that bet using any SHA256 hash tool.

It's a red flag if a casino doesn't provide the encrypted server seed for the next roll/bet in advance, or the bet's revealed non-encrypted server seed didn't matched to the previous hashed server seed (plus the ones I've mentioned above).

First, move this to Gambling Discussion since Gambling board for the official casino threads only.

Now, You'll notice that those sites have a link to their "Provably fair" article/explanation (if there's none, stay away from that casino)
From there, you'll see the "Server SEED hash" (encrypted server SEED), "Client SEED" (which you can edit)
and Nonce (just based from your number of rolls/bet).
Using those, you can find if your Roll for (example) was really a random result and not pre-defined by the casino
even without using the casino's own "roll verifier".

Just verifying if the Server SEED hash is really the hash of the Server SEED is enough to tell if the casino isn't lying:

• If you want to test, Get the Server SEED hash before your roll:
  ex: (from a casino that uses SHA256 for the server seed): a047cb939a362212ca36dd9ba5905ce5c8bb97c3f502d01309128f837e4cdea6
  then Roll the dice.
• Get the Server SEED (unencryptedunhashed) from that particular roll in the result link
  ex: ff8f0a8402fdd878b6e1d52f0eabd45f8bc3a817c55d206008729aa33e9c7d15
• Paste the server seed here: sha256-generator since the casino uses SHA256 to encrypt the server seed.
• The result should be the same as the server seed hash, if not, it's a scam casino.

You can also use the same website (pick the correct tool) to reproduce your roll result by using the Server SEED and your client SEED and other calculators given that you know the site's formula on computing each roll.
(normally, the formula is included in their provably fair link)

But they are planning to mine with what they already have thus, making the overly high power consumption the main issue.
Comparing RX470's 110W to K20x's 235W, that's already a big NO.

Anyways, we got the consensus here (like my quoted TL;DR) that those GPUs can't be used; the CPUs depend on their power cost

I've been seeing "low number of players" replies... but
PVP games really need a big player-base; dice and casino solo games, not much.

Better follow freebitcoin's example on how to attract more/big players by increasing the number of players
by distributing free but "hard-2-withdraw" balance to passerby.
Just give them enough balance to play but set an impossible to reach (through faucet) minimum withdrawal.

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$1 can buy a complete healthy meal for third-world peeps

He must be talking about leaked private keys of addresses that are still receiving dust amounts,
Most of them were reported compromised Brainwallets.

Example: 1HZwkjkeaoZfTSaJxDw6aKkxp45agDiEzN
Notice the <15sec gap between receiving and sending transactions' timestamp.

@crofrihosl Some online forwarding services (I can't find the old ones) or a script like: bitcoin.stackexchange.com will work.
You need to install bitcoin core and change some of the code (depending on what is running) to use the latter.

Or if he really need to run the bat file because multiple config reasons,
He can try to change the compatibility setting of XMRig.exe with "Run this program as an administrator".

Follow this: Right click XMRig.exe->Click Properties->Go to 'Compatibility' tab
and enable 'Run this program as an administrator' under Privilege Level

If using the batch file negates the run as admin flag,
at least he can open it directly without the hassle of right-clicking and hitting run as administrator everytime.

The AC cooling isn't much of a concern since the Data center and AC units must be active as we speak.
For the Electric consumption, it will definitely rise as all of the idle CPU cores will become active when mining.

Depending on the OS installed (namely, Linux and Windows), you can mine CPU-optimized coins (Monero as suggested by phil) using those servers since Intel Xeon E5-2660 is a quite powerful CPU.
But in terms of power cost per performance, you're on the losing side.

The GPGPU nodes' Nvidia tesla K20x are a bit outdated for today's standards either,
However, mainstream AltCoins like Ethereum mainly uses the Memory for the DAG file and that GPU has 6GB of memory.
The main problem is its power consumption of: 235W TDP
That's double (or more) than the power consumption of the recommended GPUs for ETH mining.

TL;DR: The GPU nodes won't be profitable, the CPUs might break even or profit depending on the power cost.

I'm not experiencing any lag either, maybe because I'm using a semi-modern GPU and spec (PC).

I haven't done an extensive analysis but here's what I found out:
The homepage is GPU intensive even though there's no loaded game.
My GPU Core load spiked up to 30% (it even reached 70% for a spit sec), I'm also monitoring the site using Chrome's task manager (Shift+ESC),
there are two GPU-intensive processes: the website itself (relatively low) and "GPU Process" which increased after I loaded the website.

For newer phones and tablets, it wont be a problem; but for entry/older models, it will definitely lag.

[1] Bring your laptop in the middle of a forest/dessert then create your wallet.
It's silly, but you get the idea: move to a place where there's no structure within a few meter radius around you.

[2] Not sure if this will work (theoretical):
Buy another HDMI cable, do not use VGA/DVI,
lay it down in a different direction of your currently installed cable, do not connect it yet.
When you're ready to create the wallet, change the position/location of your PC & monitor and switch the cables.
(This way, the hacker might lose the signal, if not, might become too fuzzy and will take a few sec to re-calibrate)
Then copy you SEED and create the wallet as fast as possible.

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For trojan, aside from Antivirus.
just create the wallet in an air-gap machine and transfer the already created wallet file to your online machine.

Electrum and other wallets (except Core):
You will have to re-enter the SEED in the wallet creation wizard for verification which will defeat its purpose.
Besides, printer's signal or your keyboard strokes can be hacked over the air too.

Username: nc50lc
Post Count: 1579
BTC Address (must be SegWit): 39Lymaa222Ryp9DMdDcRviYcBijTJS2e5j

You seem to be interested in 51% attack... yes?
Then download Satoshi's whitepaper: https://bitcoin.org/en/bitcoin-paper, go to article 11 (Calculations).
And you'll see the chance of doing that "heist", as well as the theoretical budget that you need to execute such an attempt based from needed hash power.

You can also learn what are the possible options (not just re-connecting orphaned blocks) for the attacker;
and lastly, why merchants/services are waiting for more confirmations

If you kept your coins in that pool before block 8750000 was mined, then they are the only ones who can tell if you can get your "forked coins".
If it is in your wallet and not spent before that particular block (any client that you can access the private keys), you can restore them to a different client that supports the "other" fork.

Speaking of Atlantis, it's designed to be the "new version" of Ethereum Classic (Unlike Bitcoin forks that's obviously money duplicator scam).
So the "new coins" will still be Ethereum classic and the old coins/chain may stay active (if there's enough miners, nodes that didn't want to update and the old code maintained by different developers) or may get abandoned by supporters.

FYI, Atlantis is winning in percentage, but the old chain is still alive as of now.
If the old chain didn't stay, so the "forked coins".

If you've already visited Github, I guess you have already seen the link to bitcoincore.org.
If not, here's the list of (compiled) releases: https://bitcoincore.org/en/releases/
All but 0.11.1 have windows executable.

For research purposes, you can also check the earliest commits from sourceforge:

• https://sourceforge.net/p/bitcoin/code/2/log/?path=
• https://sourceforge.net/p/bitcoin/code/12/log/?path=
• ..to view the later commits, add "10" to "12" of the previous page's url. like:
• https://sourceforge.net/p/bitcoin/code/22/log/?path=
• ..and so forth.

That will happen if you keep the directory path or typed the new name in the dialogue box (of your OS) after you've clicked "choose",
you need to delete all that's written after the "wallet:", type the new wallet's name and click next.

I'll update this with images to be clear:

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-update-
Here:

Not Here:

If you used the latest version at the timestamp of the OP which is: 3.3.6;
there were only two updates that occurred after it that have RBF improvements, but I can't see any minimum recommended bump fee update.

In the latest: Just two [solved] crash reports caused by errors. (#5502 and #5483)
In the later one: Changed/Prioritize another way to add the extra fee. (from deducted from the outputs' amount or change->to add more input(s) if needed)

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-edit-
Since it's almost 3months, I've opened a new issue: #5636
Let's see if they will link a duplicate.

Us too.
You added too little info but there are too many clients out there.

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I'll just try to deduct your possible wallet from the commonly used ones followed by the instructions/link.

• Bitcoin Core/Qt -> There's no Mnemonic Phrase available as a backup (definitely not this)
  
• Electrum -> Have an exclusive SEED format that can't be used to other wallets. (File->New/Restore->Enter File name->Next->Standard Wallet->I already have a SEED)
  
• Blockchain.com online wallet -> New version uses BIP39 / (.info) Old version uses SEED-look-a-like format: (https://login.blockchain.com/#/recover)
  
• Hardware wallets -> most models must re-enter the same Passphrase to be able to restore the correct addresses (Usually, there's a "restore" button somewhere in the setting)