Understanding Bitcoin Mining

Introduction

In this section, we're going to explore the fundamentals of Bitcoin and how Bitcoin mining works. We'll break down what Bitcoin is, how the Bitcoin network operates through its key participants—users, miners, and nodes—and why each of these roles is crucial for maintaining the security and decentralization of the network. You'll also learn about the economic factors that drive Bitcoin's value, the importance of mining in supporting the Bitcoin ecosystem, and the technical aspects of mining rigs. Whether you're new to Bitcoin or looking to deepen your understanding, this section will provide a solid foundation to get you started.

What is Bitcoin?

Bitcoin is a revolutionary peer-to-peer electronic cash system that operates without the need for intermediaries like banks or payment processors. It is built on a decentralized network where trust is established through cryptography and consensus, rather than central authorities. Understanding the Bitcoin network involves recognizing the roles of its three key participants: users, miners, and nodes.

Users: The Participants in the Network

Users are the individuals and entities who interact with the Bitcoin network by sending, receiving, and holding Bitcoin (BTC). Every transaction made by a user is recorded on the blockchain, a transparent and immutable public ledger. Users have full control over their Bitcoin, meaning they can manage and store their assets without relying on third parties. This autonomy is one of Bitcoin’s most significant innovations, offering users the ability to transact globally, securely, and without censorship.

Miners: The Backbone of Bitcoin’s Security

Miners play a critical role in the Bitcoin network by adding new transactions to the blockchain. They do this by grouping transactions into “blocks” and then solving complex mathematical puzzles that require significant computational power. This process, known as mining, is energy-intensive but essential for securing the network. In return for their efforts, miners are rewarded with newly minted BTC and all the transaction fees from the block. This reward system incentivizes miners to continue securing the network and validating transactions, ensuring the integrity and decentralization of Bitcoin.

Nodes: The Guardians of the Network’s Rules

Nodes are the distributed computers that validate and relay transactions across the Bitcoin network. Each node operates on a set of rules, known as the Bitcoin protocol, which ensures that all transactions and blocks conform to the consensus rules. These rules include checks for double-spending, correct block sizes, and proper transaction formats. Nodes are crucial for maintaining the decentralized nature of Bitcoin, as they independently verify every transaction and block before it is accepted into the blockchain. By running a node, participants contribute to the security and transparency of the network, helping to keep it resistant to fraud and manipulation.

Why These Roles Matter

The synergy between users, miners, and nodes is what makes Bitcoin a robust and secure system. Users benefit from a decentralized currency that is not controlled by any government or institution, miners are rewarded for their contribution to the network's security, and nodes ensure that all transactions adhere to the rules, preserving the integrity of the blockchain.

For additional information here’s the Bitcoin.org explainer and a Bitcoin Explained video.

Bitcoin’s value has grown exponentially over time

The price of Bitcoin is extremely difficult to predict; nobody has a crystal ball. However, the bullish case for Bitcoin derives from one main idea: the supply of BTC is capped at 21,000,000, while the supply of USD and other fiat currencies grows at a historical rate of ~7% per year. 

Here’s a chart showing how Bitcoin has performed since inception.

Financial firms analyze Bitcoin and offer their own price predictions.

Fidelity makes their case for Bitcoin  in this investment report 

Standard Chartered forecasts Bitcoin to hit $120K in 2024. 

Ark Invest predicts that Bitcoin could be worth $3.8 million by 2030

Swan Bitcoin provides a round up of various price predictions. 

If You Believe in Bitcoin then You Believe in Bitcoin Mining

Mining is the foundation of the Bitcoin network. By mining, believers in Bitcoin can directly contribute to the security and decentralization of the network. Mining helps to validate and verify transactions, ensuring the integrity of the blockchain. Miners play a critical role in maintaining the decentralized nature of Bitcoin. By participating in mining, individuals help to prevent the concentration of power and control in the hands of a few large entities.

Profitable Bitcoin miners are those that can mine 1 BTC for less in electricity costs than what the current market price of BTC is. During bull markets, the price of BTC increases exponentially. Meanwhile, miners' electricity costs remain fixed, generally allowing their profit margins to grow. If you are bullish on BTC, mining is the best way to express that.

Over $25M worth of Bitcoin is Mined Every Day

Every 10 minutes, a new block is added to the Bitcoin blockchain, which means around 450 BTC is mined daily. On top of that, there are also an additional 5 BTC in transaction fees each day. If Bitcoin is priced at $55,000, that adds up to roughly $25 million worth of Bitcoin being mined every day. Over the course of a year, that’s more than $9 billion

And this BTC is earned by Bitcoin Miners.

Bitcoin Halving

Every four years there is a Halving, where the supply of new BTC entering circulation is cut in half. In the year 2140, all BTC that will ever exist will be in circulation. The most recent halving occurred on April 19th, 2024, with the next one expected around March or April of 2028. You can find more information about Bitcoin halving here.

While the amount of BTC getting mined goes down over time, the $ value of that Bitcoin has been going up over time, as you can see below.

Orange Line: Bitcoin Mining Revenue in terms of BTC (fewer BTC getting mined over time)

Green Line: Bitcoin Mining Revenue in terms of USD (Value of Mine BTC increasing, higher highs & higher lows)

What is a Bitcoin Mining Rig?

Bitcoin mining rigs, known as ASICs (Application Specific Integrated Circuits), are highly specialized computers engineered specifically for the task of mining Bitcoin. These machines are optimized for energy efficiency and computational power, making them far more effective at mining than general-purpose computers. 

Major vendors of Bitcoin mining rigs include Bitmain, MicroBT and Canaan. They offer a variety of models tailored to different performance levels and energy consumption needs. 

Here are examples of models from each of the vendors.

Bitmain Antminer S21 Pro

MicroBT Whatsminer M66S

Canaan Avalon Miner A1466-150T

Mining rigs are rated by their Hashrate and their Energy Consumption. The Bitmain S21 Pro at 200 TH/s (terahash/second) consumes 3510 Watts of energy. That is as much energy as fifteen household refrigerators. 

And rigs are loud. Bitmain S21 Pro can produce 76 decibels of noise at 86°F/30°C when the fan is at maximum rotations per minute (RPM). In general, a single bitcoin mining rig can produce 70–90 decibels of sound, which is comparable to a loud vacuum or food blender.

On top of that, the rigs are hot. The Bitmain S21 Pro generates approximately 11,935 BTUs per hour which is more than twice the heat of a standard space heater.

You can find more information on Mining Rigs here.

How Bitcoin Miners earn Bitcoin

Bitcoin miners earn their rewards from two main sources: newly created Bitcoin, known as the block subsidy, and transaction fees.

Right now, every time a new block is added to the blockchain—about every 10 minutes—miners are awarded 3.25 BTC. This is the block subsidy, and it’s a key part of how miners make money.

In addition to the block subsidy, miners also earn revenue from transaction fees. The amount they earn from fees depends on how much demand there is to use the Bitcoin network. Since each block is added roughly every 10 minutes and has a limited amount of space (4 megabytes), transactions compete for inclusion. This competition drives a fee market where users bid higher fees to ensure their transactions are processed quickly. As the block subsidy gradually decreases over time, transaction fees will play an increasingly important role in mining revenue, eventually becoming the primary source of earnings for miners.

The Challenge of Adding a Block to the Bitcoin Blockchain

To give you a sense of how hard this is, a Bitmain S21 Pro at 200 TH/s (200 trillion hashes per second) is competing with the rest of the Bitcoin network which is ~600 EH/s (600 quintillion

hashes per second). So one ASIC is approximately 0.000033333% of the total hashrate in the Bitcoin network.

Due to this level of difficulty the vast majority of Bitcoin miners participate in a “pool” where any miner rewards are shared across all the miners in the pool. You can find more information on the Marketplace pool here.

How Mining Rigs Profit

The “Magic Formula” 

Understanding Hashrate

The term “Hashrate” can be used to refer to the total computing power of all bitcoin miners on the network, and also the individual computing power of a single bitcoin miner. 

Hashrate is a measure of the computational power being used to mine and process transactions on the Bitcoin network. It represents the number of calculations (or hashes) that a mining rig or the entire network can perform per second. Hashrate is typically measured in terahashes per second (TH/s) or peta-hashes per second (PH/s), where:

• 1 TH/s = 1 trillion hashes per second

• 1 PH/s = 1,000 TH/s

Hashrate is important for three key reasons:

1. Mining Power: A higher hashrate means a mining rig can process more hashes per second, increasing the chances of successfully mining a new block and earning rewards.

2. Network Security: The overall hashrate of the Bitcoin network is an indicator of its security. A higher network hashrate makes it more difficult for any single entity to perform a 51% attack, where they could potentially manipulate the blockchain.

3. Revenue Calculation: Hashrate is directly tied to revenue in Bitcoin mining. The revenue formula is based on multiplying the hashrate of a mining rig by the current hashprice, which is the earnings per unit of hashrate.

Understanding Hashprice

Hashprice is a metric that represents the expected revenue a miner can earn per unit of hashrate over a certain period, usually expressed in dollars per terahash per day ($/TH/day). It essentially tells miners how much they can expect to earn from their mining operations, taking into account both the block rewards (newly minted Bitcoin) and transaction fees collected from confirming transactions.

Key Factors Influencing Hashprice include:

1. Bitcoin Price: Higher Bitcoin prices increase the value of rewards, thus raising the hashprice.

2. Mining Difficulty: Mining difficulty adjusts approximately every two weeks based on the total hashrate of the network. When difficulty increases, it becomes harder to mine Bitcoin, which can reduce hashprice if the Bitcoin price remains constant.

3. Transaction Fees: When transaction fees are high, especially during periods of network congestion, the hashprice can increase as miners earn more per block.

   

An Example

As an example using the Bitmain S21 Pro:

• Hashrate = 200 TH/s

• Hashprice = $42 per PH/day (which is equivalent to $0.042 per TH/day)

• Energy Consumption = 3510 watts (or 3.51 kW)

• Energy Cost = $0.08 per kWh

Revenue = 200 TH/s x $0.042 TH/day = $8.4 per day.

Cost = 3.51 kW x $0.08 kWh x 24 hours = $6.74 per day.

Profit = $8.4 - $6.74 = $1.66 per day.

You can use the Marketplace Profitability calculator to see how this works for other types of miners and with different Hashprice price scenarios.

While the hashprice can fluctuate daily based on changes in Bitcoin’s price and transaction fees, a significant adjustment in hashprice occurs approximately every two weeks due to the mining difficulty adjustment. 

Understanding Energy Consumption

The typical energy consumption range for a mining rig is 500 watts to 5,000 watts (0.5 kW to 5 kW). High-performance rigs tend to be closer to the 3,000 to 5,000-watt range, providing the best hashrate-to-power consumption ratio.

For comparison each high performance rig is like 15 refrigerators, a central air conditioner, or an electric oven.

Difficulty Adjusts every 2 Weeks

1. Mining Difficulty Adjustment:

The Bitcoin protocol adjusts the difficulty every 2016 blocks, which typically takes about 14 days.

This adjustment is based on the total network hashrate over the previous two weeks. The goal is to maintain an average block time of 10 minutes.

1. Impact on Hashprice:

If Difficulty Increases: When more miners are contributing hashrate, the difficulty increases. If the Bitcoin price remains constant, this increase in difficulty makes it harder to mine Bitcoin, potentially lowering the hashprice.

If Difficulty Decreases: If miners leave the network or reduce their hashrate, difficulty decreases. This reduction makes it easier to mine Bitcoin, which can increase the hashprice if the Bitcoin price stays stable.

Thus, while hashprice can vary day-to-day due to market conditions like Bitcoin price and transaction fees, the bi-weekly difficulty adjustment is a key event that miners track, as it can lead to more significant changes in profitability.

Want to Learn More About the Blockchain and Proof of Work?

Now that you’ve gained a solid foundation in Bitcoin and its core concepts, you might be interested in delving deeper into the technology that powers it all: the blockchain and Proof of Work. These resources will guide you through various aspects of these technologies, from introductory explanations to in-depth analyses and academic perspectives. Whether you’re looking for a simple overview or a comprehensive study, these materials will help you further understand the intricate workings of the Bitcoin network.

How Bitcoin Works by Bitcoin.org

An official resource that explains the basics of Bitcoin, blockchain, and Proof of Work in a simple and accessible way.

Mining 101 by Blockware Intelligence

A comprehensive guide that covers the basics of Bitcoin mining, including how blockchain technology and Proof of Work are fundamental to the network's security and operation.

The Bitcoin Standard by Saifedean Ammous]

A highly regarded book that explores the economics, history, and technical aspects of Bitcoin, including a detailed explanation of blockchain technology and Proof of Work.

Mastering Bitcoin by Andreas M. Antonopoulos

This book provides a deep dive into the technical workings of Bitcoin, including a detailed look at blockchain technology, Proof of Work, and how transactions are processed,

Bitcoin Mining for Beginners by Braiins

This blog post explains Bitcoin mining using a simple dice analogy, illustrating that mining is more about chance and probability than solving complex math problems.

Bitcoin and Cryptocurrency Technologies by Arvind Narayanan

A comprehensive academic textbook that covers the underlying technologies of Bitcoin, including blockchain and Proof of Work, along with discussions on security and decentralization.

Proof of Work and Mining: An Introduction by Binance

An article that provides an introduction to the concept of Proof of Work, its importance in the blockchain, and how it secures the network.

6.25 in Review by Blockware Intelligence

A retrospective of the 2020 - 2024 Bitcoin Halving Epoch. This report provides an in-depth analysis of the Bitcoin network's performance and developments, with a focus on the role of mining and the impact of Proof of Work on the ecosystem.

Conclusion

We've covered a lot of ground in this section, giving you a comprehensive overview of Bitcoin and the mechanics of Bitcoin mining. You now understand the roles of users, miners, and nodes in maintaining the Bitcoin network and why mining is essential for its security and decentralization. We've also discussed the factors that influence Bitcoin's value and how mining rigs operate, including their energy consumption and the challenges involved in adding new blocks to the blockchain. With this knowledge, you're well-equipped to dive deeper into the world of Bitcoin and mining, whether you're looking to invest, mine, or simply learn more about this revolutionary technology.