Bitcoin network hashrate level and trend, derived from difficulty (expected, 2016-block epoch). hashrate_eh = difficulty × 2^32 / 600 s for the epoch in force, read from block headers — an expected rate, not a measured one. Takes no arguments. Returns { as_of, hashrate_eh (exahashes per second), pct_30d, pct_90d, hashrate_source, basis, difficulty, difficulty_height, difficulty_source_url, why, disclaimer }. Example: {}. Information, not financial advice. Every answer carries data_contract { source, as_of, status, corrections_url, license }. This server answers bounded questions, one question, one answer; for bulk, history, backfills and scheduled pulls use the CSVs and datapackage.json at https://coinbucha.com/data.