Once Bitcoin mining stops, the verification and security of the Bitcoin network will rely solely on transaction fees paid by users. Currently, the block reward, which is newly minted Bitcoin given to miners for verifying transactions, makes up the majority of miners' revenue. As this reward decreases over time due to the pre-programmed halvings that occur roughly every four years, transaction fees will need to increase to incentivize miners to continue securing the network.
Without the block reward, miners will only be rewarded through the collection of these transaction fees. This could lead to a smaller number of miners, as only the most efficient and profitable operations will be able to sustain themselves on transaction fees alone. The network may also become more centralized, as larger mining pools or facilities could dominate the landscape. However, as long as there is demand for Bitcoin transactions, there will likely still be an incentive for some miners to continue verifying the network, even if profitability declines. The long-term viability of the Bitcoin model in this scenario will depend on whether transaction fees can adequately replace the block reward to maintain a secure and decentralized network.
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