Block Reward
The block reward is the amount of new TAO the network creates each block and shares across the whole network. Official documentation puts the network emission at 1 TAO per block, roughly every 12 seconds, until the first halving, after which it fell to 0.5 TAO per block.
References: Emission
A Network-Wide Amount per Block
The reward is minted per block for the network as a whole rather than separately for each subnet. That network-wide amount of TAO is then spread across subnets and their participants. So the block reward describes how fast new TAO enters the system overall, before any split between subnets is applied.
References: Emission, Halving Mechanisms
Halving the Reward
The block reward does not stay constant. At supply-based thresholds the documentation describes the reward being cut by 50 percent. The first such halving lowered it from 1 TAO to 0.5 TAO per block, and later halvings will continue to halve it. Each cut slows how quickly new TAO is issued, which is how issuance tapers as it approaches the supply cap.
References: Halving Mechanisms, Emission
Effect on Subnets
Because the per-block TAO is injected across subnets, a change in the block reward flows through to them. The documentation notes that when a halving cuts the reward, it also lowers the daily TAO emission and cuts the TAO injected into subnet pools. Each subnet additionally emits its own alpha each block, which is tracked separately from this network-wide TAO reward.
References: Emission, Halving Mechanisms
Development Stage Context
The Introduction to Bittensor describes subnet development as moving from localnet to testnet and then mainnet. For block reward, that sequence changes how readers should interpret per-block TAO issuance and halving examples.
In localnet, block reward and coinbase cadence can be tested in an isolated environment. Localnet issuance amounts do not represent production supply schedules.
On testnet, per-block emission can be exercised in a shared non-production network. Testnet halving thresholds and block rewards are separate from mainnet chain state.
On mainnet, block reward describes live production TAO issuance per block across the network. Observed amounts depend on how many halvings have occurred and current chain state (Emission).
The Bittensor Networks reference separates mainnet, testnet, and localnet. A block-reward example from one environment should not be read as representing production issuance in another environment.
Relationship to Yuma Consensus
Block Reward and Yuma Consensus describe related parts of Bittensor’s incentive system. Yuma Consensus is the on-chain process that aggregates validator weight signals within a subnet into miner incentives and validator dividends, applying consensus clipping, bonding, and emission calculation (Yuma Consensus).
For readers, block reward names a specific part of that incentive picture, while Yuma Consensus names the consensus process that turns validator weights into the resulting incentives and dividends.
Reader Boundary
This page defines the concept at a high level. The exact per-block reward in force depends on how many halvings have occurred; after the first halving it is 0.5 TAO per block, and it will fall further at later thresholds. Current emission figures and the timing of the next halving are live chain state and should be read from current Bittensor sources.
Reference: Emission
Coinbase Advances Emission Each Block
Official Coinbase Implementation documentation describes coinbase as the per-block mechanism that advances emission processing on Subtensor. The block reward names how much new TAO enters the network in that block; coinbase names the runtime step that carries that issuance forward through the emission pipeline.
That distinction keeps the reward label separate from the processing label. Block reward answers how much TAO is created per block for the whole network, while coinbase answers how the chain advances emission accounting as each block is produced.
References: Coinbase Implementation, Emission
Injection Runs Every Block Before Distribution
Official Emission documentation separates the emissions process into injection and distribution. Injection adds new liquidity to each subnet’s pools every block, while distribution waits until the end of each tempo before participants extract the accumulated value.
The Glossary: Emission states the same rhythm in plain terms: every block, TAO is injected into each subnet, and every tempo the accumulated value is extracted by miners, validators, stakers, and subnet creators through Yuma Consensus.
Block reward vocabulary therefore belongs to the per-block issuance side of that pipeline. A lower block reward slows how much TAO enters the injection stage each block, even though participant-facing payouts are still grouped and settled on the tempo boundary.
References: Emission, Glossary: Emission
Supply Thresholds Trigger Network Halvings
Official Halving Mechanisms documentation describes TAO halvings as supply-based cuts to network issuance. The Glossary: Halving entry ties those cuts to total TAO supply crossing documented thresholds, after which the per-block reward is reduced.
That schedule explains why the block reward is not a permanent constant. The article’s 1 TAO and 0.5 TAO examples describe documented pre- and post-first-halving figures from official emission material, while later thresholds continue the same halving pattern as issuance approaches the supply cap (Emission).
Block reward reading should therefore stay with documented issuance rates and halving mechanics rather than with live mainnet figures. The concept names the per-block mint rate; the halving index names where that rate sits along the supply-based schedule.
References: Halving Mechanisms, Glossary: Halving
Relationship to Maximum Supply
Block reward and maximum supply are related but different tokenomics terms. Block reward names the amount of new TAO minted each block for the whole network, while maximum supply names the protocol’s lifetime ceiling on total TAO that those per-block mints approach (Glossary: Block Reward, Glossary: Maximum Supply).
For readers, block reward is the per-block mint rate and maximum supply is the cap it accumulates toward. Halvings cut the block reward at supply thresholds, so the per-block amount falls as cumulative issuance climbs toward the documented 21 million TAO ceiling (Halving Mechanisms).
These terms sit on different sides of supply. Maximum supply is the fixed lifetime bound, while block reward is the per-block mint path that approaches it; because halvings are supply-based rather than time-based, the timing of that approach is dynamic (Emission).
Readers should not treat the block reward as the cap, or read the maximum-supply ceiling as a per-block figure. Block reward names the per-block mint amount, while maximum supply bounds the total TAO that will ever exist.