The double spend might have been made possible, because your transaction was done off-chain on their internal database. You cannot do this "on-chain" because you need to have control over 51% of the hash power of that specific coin. The site is closed now, so you will not be able to rectify the problem. <Did you manage to withdraw the second amount or is this just the balance that are shown in your wallet?>

It just shows you why centralized services like this, is never a good idea. 

The problem with this is that most people walk around like donkeys with flaps at the side of their face. The government put the flaps there with Fiat currencies, for them not to see the financial "freedom" that we have come to see with the introduction of Bitcoin. It is our responsibility to share Bitcoin with those stubborn donkeys and to steer them into a new direction. 

You do not know what financial freedom means, until it is taken away. <Just ask China and Greece and Zimbabwe> 

A 1 Satoshi Martingale can quickly add up to a lot of Satoshi's if you are on a losing streak. Unfortunately I cannot do this with my account, because it will quickly eat into my deposit balance that I left there for the 4.08% interest that I earn on the site. 

I can assure you the Martingale strategy does not work on Freebitco.in in, I tried it with several different variants and all of them failed. I do not think that they implemented a counter measure for it, but I do know it does not work.

Good luck, you might be more lucky than I were before. 

Ok, so you want smart people to help you solve a puzzle, with no guarantee that they might get any reward for their effort? I doubt if smart people like that will share their time and energy to solve puzzles like this and who says one of them will not rather do this on their own, when they see 300 bitcoins on offer. 

Good luck getting smart people who will be willing to work for a chance to get a possible reward.    Most of these puzzles are solved by friends or family of the creator of the puzzles. <My own conspiracy theory> 

Did Electrum ask you for any updates when you tried to send your funds? If it did, then you have been a victim of the latest exploit in Electrum. https://steemit.com/bitcoin/@kingscrown/important-do-not-use-electrum-for-now-huge-exploit-found

There are some "infected" servers that force you to install a fake update of Electrum and when you try to send bitcoins, it captures your password and then they send bitcoins to their own Bitcoin address.  

Warnings have been posted everywhere, cannot believe you missed it.  

Most Signature campaign members are doing this for extra income and a lot of them are not going to have the money to fund a Lightning Network hub. Yes, you might generate a little bit of money, but I doubt if it would be more than the interest you would have received, if you simply deposited that money into a Bank. <The interest rate in some developing countries range from 5% to 10%> 

So the question is, would you lock up say $1000 worth of bitcoins in a LN Hub for say a few cents profit a month or get $8 interest on the same amount, when you deposit it into a Bank account at a fixed interest rate. 

You obviously have not used Localbitcoin.com recently, they also started to request KYC verification these days.    They were the go to service for these kinds of service, but they also bowed to government pressure. The problem is, as soon as there are Fiat involved and also Banks, the service used will always demand KYC/AML verification. <Fiat = Government money> 

You might try some of the decentralized exchanges, because some of them are still new and they do not require verification yet. <They might be too dificult for newbies> 

Just remember one thing, every Dollar invested into Bitcoin is possibly a Dollar that could be invested in the commodity or stock that he is invested in, so it devalues his investments, when people invest in Bitcoin and Crypto currencies. Why would a Goldbug praise Bitcoin for instance, when that money could have driven up the demand for Gold?

They all have hidden agendas and most of them in the commodity markets and stock markets are taking big losses at the moment, so they have to bash the competing investment tools.  

India has been against Bitcoin for some time now, so I presume their reason for that might be that they are planning to create their own GovCoin to achieve the cashless economy with their own shitcoin. 

India are also struggling with the highest level of corruption in their government, so I would not be amazed if they push all other Crypto currencies out of India and forcing people to use their shitcoin. 

Time will tell, but the signs are there already. 

I do not want to take PayPal's side of this argument, but it will be fair to say that most PayPal transactions exceeds say $10 per transaction <because of expensive fees that needs to be paid to use their service>  This is not the same for Bitcoin transactions, because a lot more cheap micro transactions are being done with Bitcoin. <Much less than $5 transactions at a fraction of the price>

We have not even considered the millions of off-chain transactions that are done via the Lightning Network now. So PayPal cannot compete with Bitcoin anymore, when it comes to transaction volume. 

Any increase in Internet speed will make things a lot easier for most people running full Bitcoin nodes. I presume cutting edge new technology like 5G will be very expensive in the beginning, so it will not be very affordable to the average user. Bandwidth cost on mobile devices are also more expensive, so it will not be very practical to use it for services and Apps that needs a lot of Bandwidth. <Downloading the Blockchain>   

Most average users will use online wallets and exchanges and they do not require fast internet speed for that. 

Why not include a URL link with the box that points to this kind of thread to incentivize the person to share his or her story. You can also tell them that you will double the prize, if they share their story on this forum. <Put something in the paper work that they must mention to claim the prize.>

I just want to congratulate and thank you for doing this for Bitcoin adoption and I would encourage more people to do this or to crowdfund similar projects like this. <OP should give us a Bitcoin address to send donations to for the next GEOCACHE prize, he should not have to fund this on his own>   

I paid someone to create banner ads for me and I posted it on other platforms and I was also very successful in the early days. Since the Bitcoin price has fallen with more than 80%, my new referrals has dropped with almost 95%.  

I also struggle to retain referrals, because they quickly realize that the big prizes are not easily won and a couple of FREE Satoshi are not valued a lot, when you convert back to Fiat currencies.  

I doubt if strategies have anything to do with gambling success in games that are offered by Stake at the moment. I have tried several known gambling strategies like Martingale and Betting on Baccarat’s Banker Hand etc, but it all failed.

Gambling is based on luck and the lower the house edge, the higher the probability that you might win a bit more. Stake has some of the lowest house edge on their games, so you should be able to play a little bit longer with the same amount of money that you would have been playing at casinos with a higher house edge. 

Have you ever heard about a Sim swap? Scammers clone sim cards and they get you to reboot your phone. When you do that, they use their own cloned sim card and viola, they own your phone and can do whatever they want to.

I am also curious why you have not used the "Sign a message" option within Coinbase yet? TheQuin are 100% within his rights not to honour your request, if you have not signed the Bitcoin address, because that is standard practice on all sites, when you want to make changes. 

Well, you can track some of the coins that was "burned" on purpose. Those Burn addresses are public knowledge, so you can have a centralized website with links to all the burn addresses. Here are one article that dealt with "lost" bitcoins.   http://fortune.com/2017/11/25/lost-bitcoins/

These are just a small fraction of the known losses and I think there are a lot more that was simply not reported. <People who are too ashamed to admit it>  

Those are 3 critical indicators that Coinbase is pulling a "Circle" on the Bitcoin community. Everyone know Ripple is a Bank puppet and now they bring that into their service. They also know the history behind Neutrino (Hacking team) and their previous involvement with Mallware, but they still "trust" them.

They should not be surprised when the Bitcoin community starts to turn their back on them, because they are turning into the service that Bitcoin was meant to be replaced. <Centralized service that exploit their power and their users and also contributing to mass surveillance by governments and private individuals.> 

Coinbase will just become the next "Circle" or "Ripple", where they bend over to government pressure and greed to sacrifice their users. They hook you into their service with a bunch of empty promises in the beginning and over time greed cloud their basic principles and they completely change their business model to satisfy Banks and governments.  

People are slowly getting fed up with their poor customer support and "PayPal" type decision making, where accounts gets blocked for one sided decisions that are made by centralized organizations that are government puppets.  

Ah, I get it... you just posted this here to get more views on Youtube for your videos. You are even pointing to your next video, before it is even released.   

This is not a platform to boost your Youtube income, we discuss Bitcoin topics here and the expectation is for people to discuss the topics on this platform.

What would it really take to write a little reply to questions that was posted by people who contributed to your views? 

Man, I would panic like crazy, if I had to rely on someone else to transport me back and forth from my home to the shore. What happens in an emergency situation or if you quickly need something from the shop. <Surely your friend will get irritated, if you push his button for small trips>

What kind of internet connectivity are you getting there or do you want to be "away" from the internet too?

I watched a documentary on deep sea drilling and the construction of massive oil drilling platforms and they also had the problem with buoyancy, but they constructed ballast chambers that can be filled with sand or water, depending on the amount of buoyancy that you need. So in rough sea conditions, they fill it more to reduce the buoyancy.    <Extreme engineering>