Bitcoin’s Difficulty Hit a Record. Its Fees Didn’t.

GLOBAL — Bitcoin’s mining difficulty climbed to an all-time high on September 19, and the fees that are supposed to reward the miners doing the work went the other way. In the same week the network became harder to mine than at any point in its history, the transactions paying for that security nearly disappeared.

The scheduled retarget lifted difficulty 4.16% to a record 132.76 trillion at block 967,680. Blocks over the prior epoch arrived every 576 seconds on average, well inside the 600-second target, implying a network hashrate near 940 EH/s—within reach of its own record.

The fees that weren’t

Over the most recent 144 blocks, miners collected 452.43 BTC in total rewards, but average block fees ran just 0.0169 BTC—fees accounting for roughly 0.67% of what miners earned. The average transaction cost about $0.30, and the cheapest confirmations cleared at a fraction of a cent. For anyone sending bitcoin, that is a bargain. For the people securing the chain, it is a warning shot.

Almost the entire paycheck now comes from the block subsidy—the fixed 3.125 BTC minted with each block. That subsidy halves again around April 2028, and every halving after that. The design assumes fees eventually replace the shrinking subsidy as the thing that pays for security. A fee market this quiet is a long way from carrying that weight.

A chain that is cheap to use is a gift to savers and a question for miners: when the subsidy fades, who pays for the walls?

Why miners keep building anyway

Hashrate near a record while fees collapse looks contradictory until you follow the dollars. Difficulty rose 4.16%, and bitcoin’s price rose in step, so the dollar value of each unit of hashing—the “hashprice” miners live on—held above the levels where rigs get switched off. Miners are pouring in machines on the bet that price, not fees, keeps the lights on.

There is a benign reading. Low on-chain fees are what a healthy base layer looks like when demand for block space is calm, and fee spikes still arrive in waves when the mempool fills. Small everyday payments were always meant to move on Lightning and other layers, off the main chain by design. The open question is whether, a decade from now, a dormant fee market can fund a network whose subsidy has shrunk by more than half.

Why it matters: bitcoin’s security is paid for mostly by newly minted coins, and that stream is on a countdown—so a record-hard network running on almost no fees is a preview of a problem the protocol has years, but not forever, to solve.

Difficulty 132.76T (+4.16%) at block 967,680, the ~940 EH/s hashrate, the 452.43 BTC reward over 144 blocks, the 0.0169 BTC average block fees and the ~$0.30 average transaction fee were read live from mempool.space at 13:56 UTC on September 21, 2026; the 0.67% fee share and 576-second block time are corroborated by the Bitcoin News Digest (September 19, 2026). The 3.125 BTC subsidy and ~April 2028 next halving are protocol facts. Informational only — not financial advice.