docs: adding SLSA verification steps for cpp-server-sdk

packages/sdk/cloudflare/README.md

@@ -59,6 +59,29 @@ yarn && yarn build && cd packages/sdk/cloudflare
 yarn test
 ```
 
+## Validating SDK packages with the SLSA framework
+
+LaunchDarkly uses the [SLSA framework](https://slsa.dev/spec/v1.0/about) to help developers make their supply chain more secure by ensuring the authenticity of our published SDK packages. As part of [SLSA requirements for level 3 compliance](https://slsa.dev/spec/v1.0/requirements), LaunchDarkly publishes provenance about our SDK package builds to NPM for distribution alongside our packages. 
+
+The SLSA framework specifies some [recommendations for verifying build artifacts](https://slsa.dev/spec/v1.0/verifying-artifacts) in their documentation. For npm packages that are published with provenance, npm already [validates the authenticity of the package using Sigstore](https://docs.npmjs.com/generating-provenance-statements#about-npm-provenance). In addition to npm's validation, we recommend the following steps:
+- Ensure that the @launchdarkly/react-native-client-sdk version you're downloading was published with npm-verified provenance  
+  - Check the [versions tab in npm](https://www.npmjs.com/package/@launchdarkly/cloudflare-server-sdk?activeTab=versions) and ensure the version you're installing has a green checkmark 
+- Use the provenance published in npm to verify the authenticity of the build:
+  - Check the source commit for: 
+    - Source repository is a LaunchDarkly-owned repository
+    - Commit author is a LaunchDarkly entity
+    - (Optional) Code changes in the commit are trustworthy
+  - Check the build file and build summary for:
+    - Build is triggered by a LaunchDarkly-owned repository
+    - Build is executed by a LaunchDarkly-owned Github Actions workflow 
+    - Build steps are trustworthy
+  - Check the public ledger's transparency log entry for:
+    - Provenance is signed by Sigstore to guarantee authenticity
+    - OIDC token used to publish the provenance (Github Workflow + Source Repository fields) are LaunchDarkly-owned
+
+The recommendations above may be adjusted to fit your organization's needs and supply chain security policies. For additional questions, please contact [[email protected]](mailto:[email protected]).
+
+
 ## About LaunchDarkly
 
 - LaunchDarkly is a continuous delivery platform that provides feature flags as a service and allows developers to iterate quickly and safely. We allow you to easily flag your features and manage them from the LaunchDarkly dashboard. With LaunchDarkly, you can: