Bitcoin Halving and Network Security: Fidelity's Optimistic View
Fidelity Digital Assets has released a research report asserting that Bitcoin's halving events do not weaken the network's long-term security, countering concerns that declining block rewards might drive miners away and reduce hashrate. The report emphasizes that miners' economic incentives are not solely dependent on block subsidies; transaction fees and other sources (such as on-chain fees from Ordinals and other ecosystem activities) also play a crucial role. Therefore, even though block rewards are cut in half approximately every four years, network security does not necessarily deteriorate.
Analyzing post-halving data, the report notes that the current block subsidy has fallen to 3.125 BTC per block. However, the rise in Bitcoin's price has more than compensated for the reduction in reward quantity. Average daily miner revenue has skyrocketed from roughly $26,300 during the first halving cycle (2012) to over $40.2 million today—a more than 1500-fold increase. This surge is mainly driven by Bitcoin's price appreciation from about $12 at the first halving to over $60,000 currently (based on the report's writing period). Historically, miner incentives and network security have moved in tandem with Bitcoin's price, creating a virtuous cycle.
Evolution of Miner Incentive Structure and Future Outlook
Fidelity's report reviews the three previous halvings, highlighting the structural shift in miner revenue composition. Early on, block rewards dominated, with transaction fees negligible. As Bitcoin's price climbed and on-chain activity grew, the share of fees in total miner revenue gradually increased. For instance, during the Ordinals inscription craze in 2023–2024, Bitcoin network transaction fees spiked, providing miners with substantial extra income. This diversified revenue stream further bolsters network security, as miners could still be adequately incentivized by fees even after block rewards approach zero (around 2140).
The report concludes that Bitcoin's programmed security mechanism—fixed supply and periodic halvings—combined with market price discovery, sustains the network's long-term robustness. Fidelity advises investors not to over-fear negative security impacts from halvings, but rather to focus on Bitcoin's scarcity as digital gold and its developing ecosystem. Looking ahead, maturing Layer 2 solutions like the Lightning Network and growing on-chain applications are expected to continue providing stable fee income for miners, ensuring the network remains secure through every halving cycle.