log2(work) is the 2-logarithm of the expected number of block header hash attempts (work) that were necessary the build a block. For example, on 2023-01-01 the log2(work) required for a block was about 77. This means that 2⁷⁷ = 1.5111 x 10²³ block hash attempts (each roughly a double-SHA256 operation) would need to be done to mine a block then.

Note that this metric shouldn’t be confused with the log2_work output of Bitcoin Core, which is cumulative work required to build the chain up to a certain block. See also: What does log2_work in Bitcoin Core’s output mean?.

Related Charts

Proof-of-Work Equivalent Days

Shows the Proof-of-Work equivalent days.

Work per block

Shows the work required to mine a block.

Cumulative Work

Shows the cumulative work done.

Cumulative log2(work)

Shows the cumulative log2(work) done.