The goal was to minimize both the time between blocks and the orphan rate. 10 minutes was a convenient time that accomplished that goal well enough.

The 10 minute average is accomplished by adjusting the difficulty every 2016 block.

That's a great list. I'm not sure about #4 though. A model is very useful. It becomes a problem is when it is inappropriate or poorly applied, or when it becomes a rule-of-thumb.

Also, what about FOMO? What bias would that be?

I was banned by paypal many years ago but it never affected my ability to buy on ebay (except where paypal is the only option).

Purse.io uses bcoin, which is a Bitcoin node implemented in JS. https://github.com/bcoin-org/bcoin

Private keys must never be transmitted. The transaction should be signed offline. A hardware wallet is an excellent solution.

Your analysis has problems. If the company burns 10%, then it must own 10%, and the burn increases the value of the coins.

The company holds $10 million plus 1 million coins (10%) valued at $0.50 each. The total value before the burn is $10.5 million. After the burn the company own 0 coins so its value is only $10 million. It lost $0.5 million in the burn.

Each coin that an investor owns is worth $0.50 before the burn and $0.55 after the burn. The burn increases the value of the investor's coins by 10%.

1. You don't have to be online to receive bitcoins because the transaction is recorded in the blockchain and your wallet will see it when it goes online. In the past, bitcoins could be sent to an IP address, but that feature was disabled.

2. Your wallet checks the address to make sure that it is valid and won't try to send to an invalid address. Keep in mind that an unused address is still a valid address.

3. It is possible to send bitcoins to an unclaimed address. Bitcoins can be sent to any valid address. Bitcoins sent to an unclaimed address are lost forever.

By "unclaimed" or "unused", I mean an address for which nobody has the private key.

The fact that the price rose on Bitfinex (as well as other exchanges) does not indicate involvement by the exchange itself, as claimed by that tweet.

It's not "free" if you have to work for it.

Here is a good list: Cryptocurrencies in the Top 100 With Working Products That Are In-Use

Also, it is possible to derive all of the private keys if both the extended public key and a single private key are known.

Check out Lightning Network. It might be a good fit. It allows you to make instant Bitcoin transactions, though it isn't as straightforward as a normal Bitcoin transaction.

A coin can still succeed even if it doesn't provide a distinct benefit over another coin. Consider that there are several rental car companies even though there is little incentive to prefer one to another. For that reason, I think that you will see several classes of coins having distinct use cases and then several coins in each class -- probably a single major coin and one or two lesser coins, along with a bunch of worthless coins. So, I would add LTC, DASH, and ZCash as minor coins to the list. I might add EOS to the list simply because it has a huge following and a ton of money.

There are also a few utility tokens that are actually being used today. Binance Coin (BNB) is going to have value as long as Binance is around.

While the information is good, keep in mind that scammers will sometimes try to gain your trust by pointing out other scams.

There is no good reason to give the promoter of those channels in that article any money, or to believe they they are acting in your best interest.

"Signal" (or "pump") channels that tell you what to buy and when to buy it (such as alphapark) are typically pump-and-dump scams where the members are the intended victims.

People also frequently conflate "Bitcoin address" and "public key". A Bitcoin address is not a public key. It is the hash of a public key (along with other information). On the other hand, confusing the two is not really a problem because most people never deal with public keys.

You can make a "distributed secure database" (they already exist), but you can't make one in an environment where you don't trust the participants. The advantage of a blockchain is that anyone can participate.

I feel that his concerns are a little overblown. I agree that owning shares of a Bitcoin ETF is inferior to owning the bitcoins outright and for all the reasons he gave.

However, I don't think the concerns about manipulation facilitated by an ETF are warranted. If there is any manipulation, it will be related to Bitcoin derivatives and not the ETF itself.

The solution is simple. Don't use stops or margin when trading. You will never get stopped out and you will never get a margin call. Problem solved.

Not true. Electric cars use 50%-70% less energy than gasoline powered cars. To illustrate, consider that a gallon of gasoline contains about 30 kWh of energy. A typical car can go 20-30 miles on a gallon of gasoline. A hybrid might go 50 miles. A Tesla will go 100 miles.

Furthermore, the energy used by electric cars can be generated from non-polluting renewable sources.

The market is being manipulated by aliens from another galaxy. That must be the reason. Prices don't go up or down by themselves. It must be aliens from another galaxy. There are no other possible reasons.