Please learn how Bitcoin difficulty adjustment works, it is not possible to mine the last Bitcoin 20 years faster.
The Bitcoin protocol adjusts the difficulty in such a way, that on average 1 block is found every 10 minutes. That won't change.

It's kinda the risk that comes with being a trader. I only buy and sell when I want to do that at the current price, or I place an order to sell above the current price. But I'm not a trader: I keep my coins and euros in my own wallet, until the moment I'm ready to make a transaction.
I've said it before and I'll say it again: whales love triggering stop orders, to trigger a cascading event up to very low prices. When that happens, the whale strikes and buys your coins at a very low price.
This is also why I don't worry much when Bitcoin drops a lot in a short time: it's all manipulation, stop losses being triggered, and panic sells. Right after that the price usually bounces back up when traders try to buy back the cheaper coins.

I'm not sure if it's possible on exchanges, but if I'd ever use a stop order, I'd want to be able to set a minimum price too. For example: sell at 6% drop, but don't sell anymore if it drops more than 20%.

You could also do the opposite: place very low buy orders at several exchanges, so you can be the guy who buys 1000 ETH at 10 cents each!

It's not your wallet, so it's the only explanation for making transactions with chance sent back to itself.

I read this post a few days ago, but didn't get to check it out yet.

First: may I ask you who you are? Are you "just one person"? Are you a team? Are you an old member here who created a new account just for this?
I'm impressed, and curious! I think you've managed to stop the price drop of Blackbytes, and it has even gone up since it can be exchanged.

It would be a great gimmick at the back of business cards.

Meanwhile IOTA is bubbling up to 30 times Byteball's market cap. I've read the rebranding-suggestion before, and I now start to agree.
Tony is smart, very smart. But presentations like this won't convince the general public to start using Byteball.
I've noticed it before on literally every ICO-website: the same design and style, the same animations, the same BS slogans and buzzwords, but many people buy it.
The first woman who asks a question in this presentation sounds much better. English is not Tony's native language, which makes it many times more difficult to have a convincing story.
I'm not trying to burn Tony here (I for sure couldn't be a better job myself, no question there), I like his creation a lot, and I'm convinced it has a great future, but I think it needs to be presented to the general public in a different way.

I wouldn't bet my money on it though!

But if you want to go HD, you can simply store your seed words in steel! Or get a $10 letter punch off eBay.

I'm not familiar with Freewallet.org, but if they send funds from the same 3xxx-address, you won't get the private key to that address. It could be the export-command only works for addresses you've imported on your own.
For now, I'd suggest to start at their support. And move your remaining funds out of there!

You can (and should!) decode the transaction on your offline machine (in a closed basement without windows).
https://blockchain.info/decode-tx and many other sites can do this, you'll need one that works offline.
It also doesn't hurt to doublecheck the fees you're using.

You have to be very careful here: if your address holds 0.2 BTC in 1 transaction, you can't just send 0.1 BTC, you'll need to send the entire balance. You could send 0.1 BTC back to your cold storage (which by definition is no longer "cold" after this), but you'll need to manually take care of sending the change.

I'll assume your cold storage is a paper wallet. This is what I would do:
Step 1: create a new paper wallet
Step 2: sweep the entire Bitcoin balance into Electrum.
Step 3: send 0.1 BTC to your new paper wallet, and send the rest to an exchange.
Step 4: write this on your old paper wallet:

This is how I've done it until now (well, not exactly, but this was meant to be an illustration), and I've had no replay problems. Even if that would happen, you would have send it to Electrum, for which you control the private key.

An optional Step 5 would be to split your Bitcoin Cash, Bitcoin Gold, and next BitCore. I've recently discovered Coinomi on Android works quite easy for this.
Just in case, I always split the most valuable coin first. So Bitcoin, Cash, Gold, and last BitCore. This list will probably get a lot longer in the future...

I didn't realize it at first, but your transaction sends funds from 3JzvEy64J63pDv7KjyKsVzupMgKcwdgQU4 and returns the change to itself . That address has received 2,016.94763224 BTC in 13202 transactions, and has processed more than a hundred new transactions today. I'm starting to think your "wallet" doesn't give you access to your private keys, it just holds your funds for you, and also for many other customers.
That also means you're not the real owner of your funds, they are! If they close their service, you can't access your funds anymore (that reminds me of banks, not Bitcoin!). For that reason alone I recommend to stop using their service, there are many more Android wallets to choose from.

Combine this with the fact that your freewallet.org Android Wallet gave you the address to send your funds to, and that only leaves freewallet.org to contact about this.

Have a look at I'm BIP38 curious, please help me out!: 1 BTC reward was not enough to brute-force a BIP38 password with 6 random characters.

Without password hints, it's impossible to crack a BIP38 password if it's more than 5 characters long.

To start digesting your cryptic description, let me ask you 2 questions first:
1. Which service did you use to exchange BTC to Bitcoin Cash?
2. Did you receive your Bitcoin Cash?

Analogy: You're buying an item in a shop, and you have to pay $100. The seller wants to have $100 in his cash register, to complete the sale.
Instead of giving him $100, you accidentally drop €100 through a crack in the floor. The seller is the only one who can get your €100 back, but it's a lot of work (which means it's expensive) to get it back.
At some point in the future, when enough people dropped money through the same crack, the seller can decide it's worth recovering.
At that point it becomes interesting in crypto: who owns the accidental deposits? It it Kraken (or Bittrex or any other exchange)? Or is the person who made the mistake the owner, and if so, it his ownership based on the dollar-value at the moment it was deposited, or is it based on the amount in crypto?

From your last 20 posts:
Russian: 5
Looking for something that pays: 14
Spam: 1
I seriously considered your offer, but your posts have nothing to offer for my campaign.

Most Newbies spam and have bad English. You shouldn't join this forum to join a signature campaign, you should join the forum because you're interested in Bitcoin.
I was Full Member when I first joined a signature campaign, and I only joined that campaign because I was a Mod at the site I was advertising. After 1.5 years I only left that campaign when the site closed.

Sorry, all new applications are rejected for various reasons.

I can't think of a reason this would be better. But it's possible to do.

15xxx sounds like your Bitcoin address indeed.
Change didn't change If you just use a wallet, the wallet takes care of your change. If you sweep the funds into your Electrum, your new wallet should take care of it again. But if you import it into a new wallet, it depends on the wallet how it handles it.

There are of course sites that can explain it much better than I do, like this one (although a bit outdated): Five Ways to Lose Money with Bitcoin Change Addresses.

Congratulations on your new small fortune

When you say there's not much risk because of your low initial investment, you're looking at it the wrong way. Your initial investment is irrelevant, the current value is what you're risking now. Price Speculation is another board though.

I can only advice you what I would do, given my current knowledge: take some profit: sell a part of your coins. Sell enough to have something in your hands if the price drops, but keep enough to still have enough if the price goes up tenfold. Maybe sell 10-20% now, and do the same if the price doubles again?
Just don't panic sell if the price drops 30%, that happens quite often. Until now you've been oblivious when this happened, until now Bitcoin always recovered again.

One last thing: if you sell a part, make sure you store the remaining amount in a safe place again. If your computer is clean and trusted you can import the key. Electrum was mentioned already. Make sure you keep track of where your change goes if you just import your private key.
A modern Electrum by default asks you to write down a 12 word seed phrase. After this, you can sweep your private key instead of importing it. This takes care of your change addresses, and the seed words are enough to backup all your future transactions.

If you have an HD-wallet, your backup will work just fine. If don't have a HD-wallet, your backup will still be fine if you used less than 100 (or depending on the version even 1000) new transactions (including change) on different addresses.

In short: try using your backup. While doing this, DO NOT delete your other wallet, just rename it.

Accepted. PM me when you've updated your signature and avatar.
You have a high variety in posts, in "your altcoin-time" you would have been rejected, but your current posts are good. So keep it up

All other new applications have been rejected.

I noticed several people just apply again after I reject them. Please don't waste my time doing so!
This campaign is still OPEN!

If this is true: Bitcoin was worth $0.30 at most at the end of 2010. Before that, it was much cheaper. If you really bought a "small amount", I assume you mean you spend a few dollars on it. That means you could be looking at tens or hundreds of Bitcoins.

Considering you've had them since 2009 or 2010, you could also be looking at millions of dollars! This brings me to the next thing: do not trust your computer to enter a potentially huge amount of money in a hot wallet!

My first assumption was right: depending on when you bought them you could indeed be looking at many millions of dollars now.

We see threads like this more often lately, since Bitcoin has been in the news a lot because of it's price increases.

My advice to start: don't import your private key yet, as long as it's on paper, it's safe. Check your public address (the one starting with a 1, and most likely 34 characters long) on a block explorer such as https://blockchain.info/. Just enter it in the search field.
Don't enter your (longer) private key by mistake!

If your address indeed holds several to hundreds of Bitcoins, make a plan from there. Think about what you want to do with them, where to send them, and how to do this. You can for instance import the address on an offline device, and create transactions from there. You'll want to make accounts at trusted exchanges to sell some, get a hardware wallet to store some, and you'll need some time to arrange all this.
As long as your private key is offline, you're safe. Of course there is a chance your computer is just safe, but with an amount that could potentially be this large, I wouldn't take that gamble.