# Zstandard ## Identification A modern lossless compression algorithm and library, written as `zstd` or `ZSTD`. ## Notebook evidence - [[Scanned_20260730-1946|Scanned_20260730-1946]], PDF pages 2, 7, and 20. ## Relationships and evidentiary boundary [[zlib]] · [[XZ Utils]] · [[Software Bill of Materials]]. The notebook occurrence preserves a historical compatibility or software clue. It does not alone prove installation, use, ownership, provenance, or the exact identification of uncertain handwriting.