Public miners shed 21% BTC hashrate

TLDR

Public Bitcoin miners have collectively cut their contribution to network hashrate as they pivot toward AI and high performance computing revenue.

1. Miner cohorts tracked by analysts reduced realized hashrate, with their share falling about 21% once Bitdeer is excluded.
2. The Bitcoin networks total hashrate also declined, but less sharply, as some miners expand while others repurpose infrastructure for AI and data centers.
3. Key signals to watch are further hashrate and difficulty moves, miner earnings mix between BTC and AI, and whether fee revenue can support security over time.

Deep Dive

1. Scale Of The Hashrate Drop

According to Miner Weekly, public Bitcoin miners monitored in its cohort saw realized hashrate fall from 368.3 EH/s in Q4 2025 to 319.0 EH/s in Q2 2026, a 13.4% drop. Excluding Bitdeer, which expanded aggressively, the cohorts hashrate fell about 21%, meaning listed miners as a group are contributing materially less to Bitcoins total compute power than before the halving.

The same report notes the wider Bitcoin network hashrate declined from 1,071 EH/s to 957 EH/s, roughly a 10.6% fall, so public miners are shrinking faster than the network as a whole. Companies like Core Scientific, TeraWulf, Keel Infrastructure and Cango are dismantling or idling mining fleets to free up power and space for AI and HPC workloads, while Bitdeer is ramping its SEALMINER pipeline and increasing self mining, partially offsetting the contraction. The detailed breakdown is in this Miner Weekly summary of public miners shedding hashrate.

2. Why Miners Are Pivoting

Post halving, hashprice (revenue per unit of hashpower) has been under pressure, and several large miners now report that AI or colocation fees are more profitable than pure BTC mining. For example, Core Scientifics Q2 colocation revenue was several times larger than its Bitcoin mining revenue, and TeraWulfs HPC lease income now dominates its business.

This makes GPUs and data center leases a competing use for the same capital and electricity that once went mostly to ASIC fleets. Miners are effectively reallocating resources from securing Bitcoin to renting compute, which can offer steadier cash flows when BTC price and fees are volatile.

3. Signals For Crypto Users To Watch

Three practical indicators to monitor are:

1. Network hashrate and difficulty trends, which show whether security is stabilizing or weakening as more power leaves mining.
2. Earnings mix at major miners, especially how quickly AI/HPC revenue overtakes BTC mining revenue at listed firms.
3. Fee share of miner income, since long term security depends on fees as block subsidies shrink.

If hashrate stabilizes despite public miner exits, that suggests private or non listed miners are filling the gap. If it keeps falling while fees remain low, pressure could build for protocol changes or for miners to demand higher fees, making block space more expensive.

Conclusion

Public miners cutting around one fifth of their hashrate contribution highlights how tight post halving economics and booming AI demand are reshaping Bitcoins miner base. For crypto users, the key is not just that some miners are leaving, but whether total hashrate and fee dynamics stay strong enough to keep the network secure as capital and power migrate toward AI data centers.