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A block reward is the cryptocurrency paid to a miner or validator when they successfully add a new block to a blockchain. On Bitcoin, it combines two components: newly minted coins (the block subsidy) and all transaction fees from the transactions included in that block. The block reward is the primary incentive that keeps miners running the hardware and consuming electricity required to secure the network.
Think of it as a paycheck for the accountant who records and verifies your transactions, paid in the same currency they are securing.
Bitcoin launched with a block subsidy of 50 BTC per block in 2009. The first halving in November 2012 cut it to 25 BTC. The second in July 2016 brought it to 12.5 BTC. The third in May 2020 reduced it to 6.25 BTC. The fourth halving occurred on April 20, 2024, reducing the subsidy to 3.125 BTC per block. The next halving is estimated for 2028, which will cut the reward to 1.5625 BTC.
Each halving event reduces the rate at which new Bitcoin enters circulation, controlling inflation and extending the issuance timeline toward the fixed supply cap of 21 million BTC, expected to be reached around 2140.
The halving schedule is hardcoded into the Bitcoin protocol and occurs every 210,000 blocks, regardless of price, miner profitability, or market conditions. No central authority can alter this schedule. The predictability is a feature: investors and miners can model the supply curve decades in advance.
Historically, Bitcoin's price has risen substantially in the year following each halving, though the sample size is small. The 2012 halving preceded a rise from around $12 to over $1,000. The 2016 halving preceded a run to nearly $20,000. The 2020 halving preceded Bitcoin's surge past $69,000 in late 2021.
For most of Bitcoin's history, the block subsidy has vastly exceeded transaction fees as the dominant component of the block reward. After each halving, miners must generate more revenue from fees or see their profit margins compress unless the BTC price rises proportionally.
Major mining companies including Marathon Digital, Riot Platforms, and CleanSpark prepared for the 2024 halving by acquiring more efficient hardware, locking in power contracts at low rates, and building larger balance sheets. Miners with higher energy costs and older equipment faced the sharpest margin pressure after the reward was cut in half.
After 2140, when all 21 million Bitcoin have been mined, the block subsidy disappears entirely. Miners will earn only transaction fees for their work. Whether those fees are sufficient to sustain a profitable mining industry, and by extension the security of the network, is one of the most debated long-term questions in Bitcoin economics.
Sources:
https://www.cmegroup.com/articles/2024/bitcoin-halving-2024-this-time-its-different.html
https://blockworks.co/news/bitcoin-halving-2024-occurs
https://www.swanbitcoin.com/education/bitcoin-halving-dates/
https://www.lseg.com/en/ftse-russell/research/bitcoin-halving
https://www.ey.com/en_ch/insights/blockchain/the-bitcoin-halving-explained
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