BTC Halving: Everything to Know

By  Beluga Research October 18, 2023

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  • Bitcoin (BTC) "halving" is a predetermined event that occurs approximately every four years and reduces the block reward miners receive to control inflation
  • Halving reduces the rate at which new bitcoins are created, and is designed to limit the total supply of bitcoin to twenty-one million
  • The most recent halving occurred in May 2020, and the next will take place in April 2024
  • BTC halving has implications for bitcoin's supply, issuance rate, miner profitability, price and market dynamics


Bitcoin (BTC) "halving" is a predetermined event that occurs approximately every four years and reduces the block reward miners receive to control inflation. During a halving, the number of new bitcoins created with each mined block is cut in half.

This process is encoded into Bitcoin's protocol and is designed to control the inflation rate and limit the total supply of bitcoin to twenty-one million. Halvings are significant because they typically lead to increased scarcity and, historically, have been associated with upward price movements as supply decreases while demand remains or increases. Halving is a mechanism that helps ensure the long-term value and scarcity of bitcoin.

A Brief History

To understand bitcoin halving, it is important to explore the historical context of the cryptocurrency itself. Bitcoin was created by an anonymous individual or group known as "Satoshi Nakamoto." The Bitcoin network launched in January 2009, and the first block, called the "genesis block," was mined by Nakamoto. Initially, the block reward for mining a new block was set at 50 BTC. However, the block reward is programmed to decrease over time as part of bitcoin's design.

BTC Halving: Everything to Know

Bitcoin halving is a fundamental feature of Bitcoin's monetary policy and occurs approximately every four years, specifically after every 210,000 blocks are mined. This event is hard-coded into the Bitcoin protocol and is triggered by a predetermined block height. The first halving event took place in November 2012, reducing the block reward from 50 to 25 BTC. The second halving occurred in July 2016, reducing the block reward to 12.5 BTC. The most recent halving happened in May 2020, reducing the block reward to 6.25 BTC.

A bitcoin halving has several significant implications for the Bitcoin ecosystem. Firstly, it affects the supply and issuance rate of new bitcoins, as by reducing the block reward, bitcoin halving slows down the rate at which new bitcoins enter circulation. This limited supply and diminishing issuance over time contribute to bitcoin's scarcity, which proponents argue is a key factor driving the value as a store of value asset.

Secondly, bitcoin halving directly impacts bitcoin miners. "Mining" is the process of creating new bitcoins and validating transactions on the Bitcoin network. Miners compete to solve complex mathematical puzzles, and the first miner to solve a puzzle and validate a block is rewarded with the block reward. With each halving event, the block reward is reduced, which directly affects miners' profitability.

Miners must adapt to the reduced block reward by optimizing mining operations, reducing costs or increasing efficiency. Less efficient miners may be forced to leave the network if the block reward decrease makes operations unprofitable. This has been observed in previous halving events, leading to a temporary reduction in mining hash rate until the network adjusts.

Thirdly, bitcoin halving has implications for bitcoin's price and market dynamics. The reduction in the rate of new bitcoin issuance can create upward pressure on the price due to increased scarcity. Historically, bitcoin halving events have been associated with significant price rallies in the months leading up to and following the halving. However, it is important to note that the halving alone does not guarantee price appreciation, as market factors and investor sentiment also play a crucial role.

Getting Started

To understand bitcoin halving, it is important to grasp the basic principles of bitcoin. Bitcoin is a decentralized digital currency that operates on a peer-to-peer (P2P) network called the "blockchain." Unlike traditional currencies, bitcoin is not controlled by any single entity. Instead, it relies on a consensus mechanism called "proof-of-work" (PoW), wherein miners compete to solve complex math problems to validate transactions and secure the network.

Unique Aspects

Bitcoin has a limited supply, unlike fiat currencies that can be printed endlessly. Bitcoin's maximum supply is twenty-one million coins, and this scarcity sets bitcoin apart and adds value. But how is the issuance of new bitcoins controlled to maintain scarcity? This is where bitcoin halving comes in.

Bitcoin halving occurs approximately every 210,000 blocks, or about every four years, and during this event, the block reward for miners is cut in half. When Bitcoin was created in 2009, the block reward was 50 BTC per block, but the block reward decreases by 50% at each halving event. This process will continue until 2140 when the block reward reaches zero, and the total supply of twenty-one million bitcoins is fully minted.

The purpose of bitcoin halving is twofold. Firstly, it ensures a controlled and predictable issuance of new bitcoins, preventing rapid inflation and preserving the cryptocurrency's scarcity. By reducing the block reward over time, bitcoin becomes harder to mine, similar to the extraction of precious resources like gold. The decreasing supply and increasing demand can potentially drive the price of bitcoin higher, making it a valuable store of value.

Secondly, bitcoin halving serves as an economic incentive for miners. Miners play a crucial role in securing the Bitcoin network by validating transactions using computational power and resources. In return, they receive newly minted bitcoins. However, by periodically halving the block reward, Bitcoin slows down the supply of new bitcoins entering circulation, and this creates scarcity and motivates miners to continue securing the network even with a reduced block reward.


  • Scarcity - Bitcoin halving reduces the rate at which new coins enter circulation, creating a limited supply similar to precious metals like gold. This scarcity can potentially increase the value of bitcoin over time.
  • Inflation Control - Halving helps control inflationary pressure on Bitcoin by reducing the rate of new coin issuance. With a limited supply and decreasing production rate, bitcoin is less susceptible to devaluation caused by excessive money supply. This makes it an attractive store of value for individuals and institutions seeking to hedge against inflation.
  • Market Confidence - Bitcoin halving events are highly anticipated and widely publicized in the cryptocurrency community. The scheduled reduction in new coin supply creates predictability and transparency, boosting market confidence. Investors and traders may view this event as a positive signal for bitcoin's long-term value, leading to increased participation and investment in the market.
  • Network Security - Halving plays a crucial role in maintaining the security of the Bitcoin network. It incentivizes miners, who validate transactions and secure the network, to continue operations. As block rewards decrease, miners may rely more on transaction fees, prioritizing transactions with higher fees to ensure network integrity and security.
  • Technological Innovation - A bitcoin halving often coincides with advancements in mining hardware and technology. Miners strive to improve efficiency and reduce costs to remain profitable, and this drive for innovation has led to the development of more efficient mining equipment and exploration of alternative consensus mechanisms, benefiting the Bitcoin network and the cryptocurrency ecosystem.


  • Mining Centralization - A bitcoin halving can contribute to the centralization of mining power, as smaller miners struggle to compete with larger operations. Concentration of mining power in a few entities raises concerns about network decentralization and security.
  • Transaction Fees - With reduced block rewards, miners rely more on transaction fees. This shift may result in higher fees for bitcoin users, especially during periods of increased network activity. Further, higher fees can make small transactions less viable and limit bitcoin's use as a medium of exchange.
  • Market Volatility - Bitcoin halving events historically come with increased market volatility. Anticipation and the aftermath of a halving can trigger speculative behavior and price fluctuations. While some investors may benefit, others may find it challenging to navigate the volatile market.
  • Energy Consumption - Bitcoin mining is energy-intensive, and a halving can worsen associated environmental concerns. Miners may need more powerful and energy-consuming hardware to maintain profitability. Increased energy consumption raises questions about sustainability and carbon footprint.
  • Uncertainty - Despite the advantages, a bitcoin halving introduces uncertainty into the market. The exact impact on price and market behavior is difficult to predict, as factors like market sentiment, regulations and macroeconomic conditions influence outcomes, making it challenging to assess precise consequences.