{"success":true,"engine":"Black Belt Labs","metric_id":"M10032","name":"Mining Pool Concentration","category":"onchain","classification":"classic","update_frequency":"daily","inputs":["On-chain data","Other public data"],"inputs_are":"types of input","lookback_windows":["31 DAY"],"lookback_basis":"windows found in the implementation (INTERVAL clauses)","formula":"Herfindahl index of Bitcoin mining-pool block shares over trailing 30 days, from coinbase-tag identification of mined blocks (public blockchain data). Reported alongside the identified share; unidentified blocks are excluded from the index and disclosed. High concentration = fewer independent block producers than the decentralization narrative implies.","formula_published":true,"definition_version":"1.0","definition_history":[{"version":"1.0","effective_from":"2026-09-10T09:20:11Z","change_note":"initial recorded definition"}],"methods":["progr"],"disclaimer":"Madjik metrics are informational market indicators computed by Black Belt Labs. They are not investment advice, an offer, or a recommendation to buy or sell any asset."}