These metrics quantify the degree of SegWit adoption on the Bitcoin network. Adoption is the community-established way of measuring SegWit adoption and refers to the relative number of transactions that spent at least one SegWit input. Utilization is a more granular approach that refers to the relative number of spent SegWit inputs instead. For more information please see our research article.
This is the Point-in-Time (PiT) variant of SegWit Adoption. PiT metrics are strictly append-only and their history is immutable. The historic data does not necessarily reflect the best current knowledge, but the information at the time when a data point was first computed. PiT metrics are ideal candidates for applications in model backtesting and related quantitative purposes. Read our article on PiT metrics for more information.