Definition
Block Subsidy is the freshly created bitcoin that the protocol awards to whoever mines a valid block. It is the newly issued portion of the block reward — separate from the transaction fees that the same miner also collects — and it is the only mechanism by which new coins enter circulation.
Also known as: coinbase subsidy, mining subsidy, the issuance portion of the block reward.
How the subsidy is created and how it shrinks
Every Bitcoin block opens with a special coinbase transaction that has no real inputs. This transaction mints the subsidy out of thin air and assigns it to an address the miner controls. The amount is not chosen by the miner — it is fixed by consensus rules and validated by every node. If a miner tries to claim more than the protocol allows, the whole block is rejected, which is why the subsidy is one of the most rigidly enforced numbers in the network.
The subsidy is not constant. It is cut in half roughly every four years, an event known as the halving, which occurs every 210,000 blocks. The schedule began at 50 BTC per block in 2009 and has stepped down repeatedly; following the April 2024 halving, the subsidy sits at 3.125 BTC per block. This geometric decay is what caps total supply near 21 million coins. The subsidy will keep halving until it rounds to zero, sometime around the year 2140.
Subsidy versus block reward versus transaction fees
It is worth being precise, because the terms get mixed up constantly. The full block reward a miner earns is the subsidy plus the transaction fees attached to every transaction packed into that block. Today the subsidy still dominates the total, but each halving shifts more of the long-term incentive onto fees. When you see the coinbasevalue field in a block template, that single number already bundles the subsidy and the fees together — the miner does not get to split them out.
This matters for anyone reasoning about the network’s future security budget. As issuance trends toward zero, the mempool and the fees it generates become the thing that pays to defend the chain. Understanding the subsidy is the first step to understanding why fee markets matter.
Why a home or ASIC miner cares
For a solo miner, the subsidy is the jackpot. When your machine finds a solo block, the coinbase transaction pays the subsidy plus all the fees directly to your address. Documented finds bear this out: a single Bitaxe Supra running on a public solo pool found a block worth the full 3.125 BTC subsidy in March 2025, and a small NerdQaxe++ setup landed another block worth roughly 3.083 BTC later that year. On a solo pool that charges a fee, you keep most of that — solo.ckpool.org, for example, takes a 2% cut and forwards 98% of the subsidy plus fees to the solver.
If you instead point your hardware at a shared mining pool, you never touch the subsidy directly. The pool collects the whole block reward and redistributes it as small, steady payouts proportional to the shares your rig submits. Either way, the subsidy is the number that anchors your mining profitability math: it sets the size of the prize, while difficulty and your machine’s efficiency determine your odds and your costs.
This is also why decentralizing who gets to claim the subsidy is such a live topic. Cheap, low-power devices like a Bitaxe exist precisely so that more individuals can run their own node and lottery a block for themselves, rather than leaving subsidy-creation concentrated among a handful of large operators. Every additional home miner pointing at their own template is one more layer decentralized. If you want to chase the subsidy yourself, you can explore open, hackable hardware at the Bitaxe hub or browse purpose-built machines in the miner catalog.
Related terms: Halving, Block Reward, Coinbase Transaction, Transaction Fees, Solo Mining, Block Height
In Simple Terms
The newly created Bitcoin in each block, currently 3.125 BTC. Halves every four years until supply reaches 21M.
Block Subsidy is the freshly created bitcoin that the protocol awards to whoever mines a valid block. It is the newly issued portion of the block reward — separate from the transaction fees that the same miner also collects — and it is the only mechanism by which new coins enter circulation.
Also known as: coinbase subsidy, mining subsidy, the issuance portion of the block reward.
How the subsidy is created and how it shrinks
Every Bitcoin block opens with a special coinbase transaction that has no real inputs. This transaction mints the subsidy out of thin air and assigns it to an address the miner controls. The amount is not chosen by the miner — it is fixed by consensus rules and validated by every node. If a miner tries to claim more than the protocol allows, the whole block is rejected, which is why the subsidy is one of the most rigidly enforced numbers in the network.
The subsidy is not constant. It is cut in half roughly every four years, an event known as the halving, which occurs every 210,000 blocks. The schedule began at 50 BTC per block in 2009 and has stepped down repeatedly; following the April 2024 halving, the subsidy sits at 3.125 BTC per block. This geometric decay is what caps total supply near 21 million coins. The subsidy will keep halving until it rounds to zero, sometime around the year 2140.
Subsidy versus block reward versus transaction fees
It is worth being precise, because the terms get mixed up constantly. The full block reward a miner earns is the subsidy plus the transaction fees attached to every transaction packed into that block. Today the subsidy still dominates the total, but each halving shifts more of the long-term incentive onto fees. When you see the coinbasevalue field in a block template, that single number already bundles the subsidy and the fees together — the miner does not get to split them out.
This matters for anyone reasoning about the network's future security budget. As issuance trends toward zero, the mempool and the fees it generates become the thing that pays to defend the chain. Understanding the subsidy is the first step to understanding why fee markets matter.
Why a home or ASIC miner cares
For a solo miner, the subsidy is the jackpot. When your machine finds a solo block, the coinbase transaction pays the subsidy plus all the fees directly to your address. Documented finds bear this out: a single Bitaxe Supra running on a public solo pool found a block worth the full 3.125 BTC subsidy in March 2025, and a small NerdQaxe++ setup landed another block worth roughly 3.083 BTC later that year. On a solo pool that charges a fee, you keep most of that — solo.ckpool.org, for example, takes a 2% cut and forwards 98% of the subsidy plus fees to the solver.
If you instead point your hardware at a shared mining pool, you never touch the subsidy directly. The pool collects the whole block reward and redistributes it as small, steady payouts proportional to the shares your rig submits. Either way, the subsidy is the number that anchors your mining profitability math: it sets the size of the prize, while difficulty and your machine's efficiency determine your odds and your costs.
This is also why decentralizing who gets to claim the subsidy is such a live topic. Cheap, low-power devices like a Bitaxe exist precisely so that more individuals can run their own node and lottery a block for themselves, rather than leaving subsidy-creation concentrated among a handful of large operators. Every additional home miner pointing at their own template is one more layer decentralized. If you want to chase the subsidy yourself, you can explore open, hackable hardware at the Bitaxe hub or browse purpose-built machines in the miner catalog.
Related terms: Halving, Block Reward, Coinbase Transaction, Transaction Fees, Solo Mining, Block Height