Block rewards play an integral role in the tokenomics of a cryptocurrency. Read on to learn what is a block reward and what role it plays in the running of blockchain protocols.
A block reward explained is pretty straightforward. It is a form of incentive given to network participants called miners or validators for verifying and adding new transactions to a blockchain.
Miners are responsible for discovering new blocks in the blockchain, and these rewards serve as a way to encourage them to participate in the network and secure it.
The network participants who verify transactions in proof of work (PoW) networks, like Bitcoin (BTC), are known as miners. In proof of stake (PoS) networks, they are referred to as validators or stakers.
In the Bitcoin ecosystem, the block reward incentivizes miners to direct computing power towards securing the Bitcoin network. This reward cuts down by half every four years or every 210,000 blocks in what is known as the Bitcoin halving. Miners also receive transaction fees as part of their reward for securing the integrity of the Bitcoin network.
The reduction of the block rewards is part of Bitcoin’s mechanism to slow down the introduction of new coins into the circulating supply, which helps to power the cryptocurrency’s deflationary monetary policy.
Types of block rewards
To better understand what is a block reward, you need to know that it mainly consists of two components: the block subsidy and the transaction fees. Block subsidies are the new tokens introduced to the blockchain and given to miners for their work in discovering new blocks, confirming transactions, and securing the blockchain. Transaction fees, on the other hand, are the money paid by users of a blockchain network to get their transactions validated.
Each cryptocurrency has its own validation process and reward system. Bitcoin, for example, as stated earlier, uses the proof of work system for its block rewards. It is the original consensus mechanism that was used by cryptocurrencies, including Ethereum (ETH), in its early days.
Here, miners compete to solve complex mathematical puzzles to validate transactions and create new blocks. The miner who solves the puzzle first gets the block reward, consisting of newly minted coins and transaction fees.
In other consensus mechanisms, such as proof of stake, validators propose and validate blocks based on the number of tokens they hold and are willing to put up as collateral. They then receive rewards in the form of additional tokens, which are usually the native cryptocurrency of the blockchain they are on.
The more tokens a validator stakes, the higher their chances of being chosen to create a block, and unlike PoW, PoS networks often have a fixed annual percentage reward for validators.
The combination of mining rewards and transaction fees creates a robust incentive structure for miners, promoting network security, decentralization, and transaction validation.
Together, these elements provide the economic framework that keeps cryptocurrencies decentralized and in line with miners’ incentives for the general well-being and operation of the blockchain.
How block rewards work
Block rewards work differently depending on a blockchain network’s consensus mechanism. A consensus mechanism is a fundamental protocol used in blockchain systems to achieve agreement, trust, and security across a decentralized computer network.
There are several consensus mechanisms in use in the blockchain space, but the two most well-known ones are the previously mentioned PoW and PoS, whose participants are known as miners and validators.
How do PoW miners earn block rewards?
When proof of work miners such as those on the Bitcoin network confirm transactions, they are bundled into blocks, and a new block is added to the previous set of blocks on the blockchain.
There are currently 19.695 million Bitcoins in circulation out of the 21 million that will eventually exist. It means that there are less than 1.3 million Bitcoins still to be mined.
The block reward-earning process in PoW networks starts when miners collect pending transactions. They then perform computationally intensive calculations known as hashing to find a specific value or nonce that, when combined with the block data, produces a hash with particular properties, such as a certain number of leading zeros.
The first miner to find a valid nonce that satisfies the difficulty criteria broadcasts the new block to the network. When other network participants approve the integrity of the nonce, the successful miner receives a block reward consisting of newly minted coins specific to that blockchain.
For example, Bitcoin miners get their rewards in…
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