
Friday. The mining week, condensed.
BTC: $62,700
Hashprice: $32.51 ($28 a week ago)
Difficulty: 124.93T (−10.09%)
1. June 13: difficulty fell 10.09% — second-largest drop of the year, 11th-largest in network history. Hashprice jumped 13% over the weekend. Machines that were underwater last week are back in profit without BTC moving a dollar.
2. Then JPMorgan dropped their note yesterday: estimated BTC production cost is $78,000. Current price is $62,500. About 20% of miners are unprofitable. CoinDesk's long view: BTC has been below production cost for five straight months. June down 15%.
3. This doesn't cancel the relief from the adjustment. It explains why the adjustment matters. A 10% difficulty cut decides who stays in the game when one in five operators is already underwater.
4. Network hashrate down 23% from October's peak (1.151 ZH/s → 0.888 ZH/s). October was also the $125K BTC all-time high. Price and capacity rolling over together.
5. Per-machine income after the adjustment: ~9% higher. Same power, same hardware.
For the 20% of the network underwater, +9% still isn't enough. Older fleets, higher tariffs, stock firmware — these stack. J/TH efficiency at $32 hashprice is the variable that decides whether you're in the profitable group or the other one.
Next adjustment: ~June 28.

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