The private key (comparable to an ATM PIN) is meant to be a guarded secret, and only used to authorize Bitcoin transmissions. Thus, it’s the “private key” that is kept in a Bitcoin wallet. Some safeguards for a Bitcoin wallet include: encrypting the wallet with a strong password and choosing the cold storage option, i.e. storing it offline. In the case of Coinbase, they offer a secure "multisig vault" to host your keys, which you can sign up for. 
Finally, as everyone who held Bitcoins before the split received an equal amount of Bitcoin Cash tokens, some people voiced their concerns that the split was nothing but a money-making scheme. In fact, the hard fork did create a situation similar to a double-spending problem, as it made conducting two transactions from a single wallet using the same set of keys possible.

What these sites usually do is they take money from people around the web and promise to give them good returns. They will then start off by paying these returns through money they get from new sign ups and create a big buzz around the site. Usually they will also have some sort of referral program so that users can bring in their friends. This will go on for around 3-4 months until one day the website will just go offline and the money will be gone. No more payments will be made and a lot of people will get mad that they got scammed.
If you’re aware of the risks and still willing to take the plunge, this is what you need to know about investing in bitcoin: Cryptocurrencies exist in an unregulated, decentralized digital sphere without involvement by (or protection via) a central bank. This is part of bitcoin’s appeal. People or entities can buy and sell cryptocurrency anonymously, and there are fewer middlemen taking a cut of transactions. But it also means you can’t just buy bitcoin via mainstream investing tools like a brokerage account.
If this process sounds a bit cumbersome, it is. This means bitcoin is much less liquid than traditional equities, creating more volatility and wild swings. For instance, in the past month alone, the value of one bitcoin fell from prices over $2,500 to under $2,000 before regaining all-time highs over $3,400. Those are incredibly volatile swings within one month -- something virtually unheard of with any other type of currency!
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