Bitcoin’s network difficulty has surged to a record high above 136 trillion, creating tougher conditions for miners already dealing with shrinking revenues. The adjustment, logged at block height 913,248, marked a 4% rise from 129. 6 trillion and extended a run of five consecutive increases since June, according to figures from Mempool. Bitcoin Miners Face Tight Margins With Record Difficulty And Weakening Income This mechanism is central to Bitcoin’s design
source: https://beincrypto.com/bitcoin-miners-hit-record-difficulty/