BTC: Blocks without a Mining Label

Bitcoin Blocks without a Mining Label was 4 blocks on 7 Nov 2026 (latest daily value).

Observed canonical blocks with no matching mining label.

Why use it. Keep unmatched attribution coverage visible when reading named-label shares. How to read it. 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. Unknown means that complete observed coinbase facts match no pinned label; it does not identify one unnamed operator. A missing scalar bucket is undefined, not zero. Missing coinbase facts stop the calculation frontier; they are not classified as Unknown blocks. 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. Count blocks with no candidate from the accepted tag and first-output-address matcher. Do not count absent coinbase facts as unmatched observations. 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. Assign complete canonical blocks to UTC hours or days using their header timestamps, retaining timestamp regressions. Use locally validated canonical coinbase facts and the pinned MIT-licensed mining-pool definitions; credits and the dataset revision remain in method details.