Version 1.1 is the current version. See the Version 1.1 documentation.

SLSA specification

SLSA is a specification for describing and incrementally improving supply chain security, established by industry consensus. It is organized into a series of levels that describe increasing security guarantees.

This is Version 1.1 Release Candidate 1 (RC1) of the SLSA specification, which defines the SLSA levels and recommended attestation formats, including provenance. This version has been superseded by Version 1.0 RC2.