Bitcoin network difficulty reaches 132.76 trillion after 2026

The difficulty mechanism and historical shifts

The Bitcoin network difficulty reached 132.76 trillion on September 28, 2026. This follows a 4.16% increase on September 19. The current level reflects a 1.31% increase on September 5. These upward movements follow a 10.09% decrease at block 953,568, which brought difficulty from 138.96 trillion down to 124.93 trillion. This June contraction follows a 7.76% decrease on March 20 and an 11.16% drop on February 7. The February drop remains the 7th largest difficulty decrease in Bitcoin history. The difficulty mechanism keeps block production near the ten-minute target by comparing the actual time elapsed during the previous 2,016 block epoch against the target of 1,209,600 seconds. If blocks arrive faster than the ten-minute target, difficulty increases. If blocks arrive slower, difficulty decreases. The formula in the Bitcoin Core pow.cpp file defines this relationship. The 2024 halving broke historical patterns when difficulty increased in the first post-halving epoch due to transaction fees from the Runes protocol launch. This difficulty trend follows the end of 2025, when difficulty sat at 148.2 trillion. The 2021 China mining ban produced the most dramatic disruptions, where the network saw difficulty decline approximately 45% from 25.05T to 13.67T. This occurred after provincial governments in Inner Mongolia, Xinjiang, Qinghai, Yunnan, and Sichuan enforced bans in waves. By September 2021, the People’s Bank of China prohibited all cryptocurrency transactions. At that time, China accounted for over 60% of global hashrate. Cambridge data showed zero hashrate in mainland China during July and August 2021.

Mining pool concentration and centralization risks

Foundry USA commands approximately 27.5% of recent blocks according to seven-day averages. AntPool and F2Pool each contribute over 15%, meaning the top three pools handle more than half of all blocks mined. Smaller pools like ViaBTC, SpiderPool, and MARA Pool offer alternatives to miners seeking different fee structures or geographic focus. The high concentration of hashashrate among a few large pools creates a statistical environment where one entity mines multiple consecutive blocks, which happened during the March 23 event when Foundry produced seven blocks in a row. This event orphaned valid blocks from AntPool and ViaBTC at block heights 941,879 through 941,885. A researcher named b10c attributed the event to network latency rather than selfish mining. The orphaned blocks netted Foundry only 0.025 BTC in fees. While nothing broke, the event highlighted how scale, probability, and timing can temporarily give one pool control over the chain. Transactions from the orphaned blocks returned to the mempool for inclusion in later blocks. The Nakamoto coefficient remains at 4. This metric measures the minimum number of independent entities needed to collude to compromise a network. In 2021, the China mining ban caused four consecutive negative adjustments that reduced total difficulty by 45%. The network recovered through eight consecutive positive adjustments between August and November 2021. During that period, difficulty surpassed 21.66T and hashashrate recovered to 159 EH/s. This recovery proved the retarget mechanism works to attract operators in the United States, Kazakhstan, and other jurisdictions.

Economic pressures and the hardware market

Bitcoin trades at 77,666.00 on September 28, 2026. The estimated cost to mine one bitcoin sits at 84,300. Hashprice fluctuates between 32 and 33 per petahash per second. Miners increasingly shift capacity to artificial intelligence and high-performance computing. Cango shut down one third of its equipment to expand into AI. In Texas, the four-coincident-peak mechanism incentivizes miners to power down rigs during peak hours to lower electricity grid charges. This shift in energy use removes hashashrate from the network even if the physical power capacity remains active. The $40 per petahash-second per day threshold forces miners to decide whether to turn off rigs. This margin pressure follows the 2024 halving. Efficiency gains in ASIC technology allow some miners to maintain margins. Leading models achieve efficiencies near 9.5 J/TH under optimal cooling. Publicly traded operators like Bitdeer and Marathon expand their footprints using newer generation machines. Axel Adler Jr. described the current state of miners as a "stress zone." The Puell Multiple fell from 0.83 to 0.74 over ten days. North America holds 42.3% of the global mining hardware market. The US leads the region with 35% of global Bitcoin hashashrate. Texas remains the epicenter with facilities from Marathon Digital Holdings, Riot Platforms, and Core Scientific. The US Department of Energy’s Grid Deployment Office allocated $13 billion to modernize electrical grid infrastructure, which indirectly benefits large-scale mining operations requiring reliable power supply.

Network capacity and recent difficulty data

The network hashashrate reached 1.11 ZH/s on September 28, 2026. This follows a 7.54% increase from the previous day. This hashashrate level follows a peak of 1.43 ZH/s on February 15, 2026. In September 2025, the network sustained a hashashrate of 1 ZH/s on a 7-day average. Publicly traded operators report combined hashrates exceeding 400 EH/s. Companies like Bitdeer and Marathon expand their footprints using newer generation machines. Do current difficulty levels provide enough security for long-term holders?