BTC: Recognized Mining Label Concentration

Bitcoin Recognized Mining Label Concentration was 1,805.92 on 7 Nov 2026 (latest daily value).

Concentration of recognized mining-label block counts on the conventional 10,000-point HHI scale.

Why use it. Compare how evenly recognized blocks are distributed among labels, conditional on recognized coverage. How to read it. Use complete period counts before display grouping. Unknown and Ambiguous are not ranked as single operators. Empty periods are undefined. The pinned label list is applied retrospectively. Tags can be spoofed, and different labels can belong to the same operator. Read label coverage alongside these observations. This denominator contains recognized blocks only. An observed all-unidentified period has no HHI, even though recognized-label all-block shares are zero. Read coverage alongside the index; it is not an operator-control or antitrust finding. Read actual source coverage and clocks. Open periods remain partial; MTP closure and six later canonical blocks govern finality. The calculation describes unsmoothed observations; chart smoothing is a separate transform.

Calculation. Multiply the sum of squared recognized-label block counts by 10,000 and divide by the square of the total recognized count. Exclude Unknown and Ambiguous from this particular denominator. A zero recognized total is undefined. Use exact integer counts and 40-significant-digit Decimal division with half-even rounding. Match literal UTF-8 coinbase-tag bytes with ASCII-only case folding, together with the exact canonical address of coinbase output 0. One candidate gives a named label, none gives Unknown and conflicting candidates give Ambiguous. Use locally validated canonical coinbase facts and the pinned MIT-licensed mining-pool definitions; credits and the dataset revision remain in method details.