Bitcoin just had its biggest mining difficulty drop since 2011

Bitcoin (BTC) saw its biggest negative difficulty adjustment in almost ten years on Nov. 3 as the network flawlessly takes care of itself.

Data from monitoring resource showed that Bitcoin difficulty automatically readjusted by 16% Tuesday.

Difficulty sheds most in nine years

Estimates had previously suggested that the adjustment would be around 13%, but in the event, it was the second highest in Bitcoin’s history. Only in 2011 was there a larger difference — 18%, also coming at the end of October.

Bitcoin difficulty chart with latest drop highlighted. Source: Glassnode/ Twitter

Difficulty adjustments happen automatically every 2016 blocks, and allow Bitcoin to remain “hard” money regardless of external factors impacting miners.

Such a reduction should incentivize more mining participants to compete for block subsidy rewards, with the result that difficulty then begins to rise again.

At press time, however, estimates put the next adjustment at another -16%, indicating that the effect of Tuesday’s event had not yet been felt.

For users, the downward adjustment will reduce fees and decrease block times, along with reducing the size of unmined transactions in Bitcoin’s mempool. According to estimates from, the optimal Bitcoin transaction fee remains high — 80,000 satoshis ($11).

Bitcoin mempool size 2-month chart. Source: Blockchain

BTC price unaffected

Reacting, commentators appeared little fazed, instead praising Satoshi Nakamoto’s design for protecting network and funds integrity.

“There is no more beautiful aspect of #Bitcoin than the difficulty adjustment. Just flat out gorgeous mechanism design,” Travis Kling, founder of asset manager Ikigai, summarized on Twitter.