Block Reward

What Is a Block Reward?

Bitcoin block rewards are new bitcoins awarded to cryptocurrency miners for being the first to solve a complex math problem and creating a new block of verified bitcoin transactions.

The miners use networks of computers to do this, and every time a new block is created it is verified by all the other competing miners. Then a new math problem is introduced and the miners start over.

KEY TAKEAWAYS

A block reward refers to the number of bitcoins you get if you successfully mine a block of the currency.

The amount of the reward halves after the creation of every 210,000 blocks, or roughly every four years.

The amount is expected to hit zero around 2140.

Understanding Block Rewards

The block reward provides an incentive for bitcoin miners to process transactions made with the cryptocurrency. Creating an immutable record of these transactions is vital for bitcoin to work as intended.

The blockchain is like a decentralized bank ledger—one that can’t be altered after being created. The miners are needed to verify the transactions and keep this ledger up to date. Block rewards, and to a lesser extent, transaction fees, are their payment for doing so.

Bitcoin was designed so that new bitcoins are created at a consistent pace. So the difficulty of the math problem is adjusted every two weeks to ensure a steady output of new bitcoins—roughly one block of transactions every 10 minutes.

Bitcoin’s Block Rewards Vs. Ethereum’s

Ethereum, bitcoin’s main competitor as a cryptocurrency, also relies on block rewards to provide incentives to miners. With Ethereum, the reward is a digital token called “ether,” which is rewarded each time a miner succeeds in providing the mathematical proof of a new block. As with bitcoin, miners are also awarded a transaction fee, known as a “gas” fee.

Unlike with bitcoin, there is no limit on the number of Ethereum ether tokens that can be created, and they are created at a much faster pace—in seconds, versus about 10 minutes. So the total number of blocks in the Ethereum chain is larger than in the bitcoin chain.

The Future of Bitcoin Block Rewards

To limit inflation, bitcoin creator Satoshi Nakamoto designed bitcoin to ultimately have only 21 million bitcoins.

This is why the size of bitcoin block rewards is halved after the creation of every 210,000 blocks, which takes around four years.

At bitcoin’s inception in 2009, each block reward was worth 50 BTC.

In May 2020, the block reward was halved a third time to 6.25 BTC.

And as of May 2021, there were already 18.7 million bitcoins in existence, or nearly 90% of the total planned supply.

Ultimately, the block reward is scheduled to reach zero around May 2140, but mining will likely no longer be profitable long before that date is reached.

As of April 2039, about 99.6% of bitcoins will already have been issued, and the block reward will be just 0.19531250 bitcoin.

Along the way, transaction fees are expected to become the primary incentive for bitcoin miners

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Calculate Hashes/s

How can I calculate how many hashes I generate per second?

I have a function which generates hashes from a string:

string GenerateHash(string plainText);

I generate as many hashes as possible with 4 threads.

How do I calculate how many hashes (or megahashes) I generate per second?

Your problem breaks down nicely into 3 separate tasks

  1. Sharing a single count variable across threads
  2. Benchmarking thread completion time
  3. Calculating hashes per/second

Sharing a single count variable across threads

public static class GlobalCounter
{ public static int Value { get;
private set;
} public static void Increment()
{ Value =GetNextValue(Value);
} private static int GetNextValue(int curValue) { returnInterlocked.Increment(ref curValue);
} public static void Reset() { Value = 0; } }

Before you spin off the threads call GlobalCounter.Reset and then in each thread (after each successful hash) you would call GlobalCounter.Increment – using Interlocked.X performs atomic operations of Value in a thread-safe manner, it’s also much faster than lock.

Benchmarking thread completion time

var sw = Stopwatch.StartNew(); Parallel.ForEach(someCollection, someValue => 
{ // generate hash GlobalCounter.Increment();
}); sw.Stop();

Parallel.ForEach will block until all threads have finished

Calculating hashes per second

... sw.Stop(); var hashesPerSecond = GlobalCounter.Value / sw.Elapsed.Seconds;

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Return on Investment (ROI)

What Is Return on Investment (ROI)?

Return on investment (ROI) is a performance measure used to evaluate the efficiency or profitability of an investment or compare the efficiency of a number of different investments.

ROI tries to directly measure the amount of return on a particular investment, relative to the investment’s cost.

To calculate ROI, the benefit (or return) of an investment is divided by the cost of the investment. The result is expressed as a percentage or a ratio.

KEY TAKEAWAYS

  • Return on Investment (ROI) is a popular profitability metric used to evaluate how well an investment has performed.
  • ROI is expressed as a percentage and is calculated by dividing an investment’s net profit (or loss) by its initial cost or outlay.
  • ROI can be used to make apples-to-apples comparisons and rank investments in different projects or assets.
  • ROI does not take into account the holding period or passage of time, and so it can miss opportunity costs of investing elsewhere.

How to Calculate Return on Investment (ROI)

The return on investment (ROI) formula is as follows:

“Current Value of Investment” refers to the proceeds obtained from the sale of the investment of interest. Because ROI is measured as a percentage, it can be easily compared with returns from other investments, allowing one to measure a variety of types of investments against one another.

Understanding Return On Investment (ROI)

ROI is a popular metric because of its versatility and simplicity. Essentially, ROI can be used as a rudimentary gauge of an investment’s profitability. This could be the ROI on a stock investment, the ROI a company expects on expanding a factory, or the ROI generated in a real estate transaction.

The calculation itself is not too complicated, and it is relatively easy to interpret for its wide range of applications. If an investment’s ROI is net positive, it is probably worthwhile. But if other opportunities with higher ROIs are available, these signals can help investors eliminate or select the best options.

Likewise, investors should avoid negative ROIs, which imply a net loss.

For example, suppose Bill invested $1,000 in New Wave AI Corp. in 2017 and sold the shares for a total of $1,200 one year later.

To calculate the return on this investment, divide the net profits ($1,200 – $1,000 = $200) by the investment cost ($1,000), for a ROI of $200/$1,000, or 20%.

With this information, one could compare the investment in New Wave AI with any other projects.

Suppose Bill also invested $2,000 in Web Pirates Inc. in 2014 and sold the shares for a total of $2,800 in 2017. The ROI on Bill’s holdings in Web Pirates would be $800/$2,000, or 40%.

Limitations of Return on Investment (ROI)

Examples like Bill’s (above) reveal some limitations of using ROI, particularly when comparing investments. While the ROI of Jo’s second investment was twice that of the first investment, the time between Jo’s purchase and sale was one year for the first investment but three years for the second.

Bill could adjust the ROI of the multi-year investment accordingly. Since the total ROI was 40%, to obtain the average annual ROI, Bill could divide 40% by 3 to yield 13.33% annualized.

With this adjustment, it appears that although Bill’s second investment earned more profit, the first investment was actually the more efficient choice.

ROI can be used in conjunction with the rate of return (RoR), which takes into account a project’s time frame.

One may also use net present value (NPV), which accounts for differences in the value of money over time, due to inflation.

The application of NPV when calculating the RoR is often called the real rate of return.

Developments in Return On Investment (ROI)

Recently, certain investors and businesses have taken an interest in the development of a new form of the ROI metric, called “social return on investment,” or SROI.

SROI was initially developed in the late 1990s and takes into account broader impacts of projects using extra-financial value (i.e., social and environmental metrics not currently reflected in conventional financial accounts).1

SROI helps understand the value proposition of certain environmental social and governance (ESG) criteria used in socially responsible investing (SRI) practices. For instance, a company may decide to recycle water in its factories and replace its lighting with all LED bulbs. These undertakings have an immediate cost that may negatively impact traditional ROI—however, the net benefit to society and the environment could lead to a positive SROI.

There are several other new flavors of ROI that have been developed for particular purposes. Social media statistics ROI pinpoints the effectiveness of social media campaigns—for example how many clicks or likes are generated for a unit of effort. Similarly, marketing statistics ROI tries to identify the return attributable to advertising or marketing campaigns.

So-called learning ROI relates to the amount of information learned and retained as a return on education or skills training.

As the world progresses and the economy changes, several other niche forms of ROI are sure to be developed in the future.

Frequently Asked Questions

How do you calculate return on investment (ROI)?

Return on investment (ROI) is calculated by dividing the profit earned on an investment by the cost of that investment.

For instance, an investment with a profit of $100 and a cost of $100 would have a ROI of 1, or 100% when expressed as a percentage.

Although ROI is a quick and easy way to estimate the success of an investment, it has some serious limitations.

For instance, ROI fails to reflect the time value of money, and it can be difficult to meaningfully compare ROIs because some investments will take longer to generate a profit than others.

For this reason, professional investors tend to use other metrics, such as net present value (NPV) or the internal rate of return (IRR).

What is a good ROI?

What qualifies as a “good” ROI will depend on factors such as the risk tolerance of the investor and the time required for the investment to generate a return.

All else being equal, investors who are more risk-averse will likely accept lower ROIs in exchange for taking less risk.

Likewise, investments that take longer to pay off will generally require a higher ROI in order to be attractive to investors.

What industries have the highest ROI?

Historically, the average ROI for the S&P 500 has been about 10% per year. Within that, though, there can be considerable variation depending on the industry.

For instance, during 2020, technology companies such as Apple Inc., Microsoft Corp., and Amzon.com Inc. generated annual returns well above this 10% threshold.

Meanwhile, companies in other industries, such as energy companies and utilities, generated much lower ROIs and in some cases faced losses year-over-year.

Over time, it is normal for the average ROI of an industry to shift due to factors such as increased competition, technological changes, and shifts in consumer preferences.

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