Kosli vs Sigstore

Kosli is a change-recording and compliance-monitoring platform for tracking software and business-process changes. It centralizes attestations, software bills of materials, scans, and build metadata, then links that evidence to a real-time production view. Cryptographic provenance and fingerprints create a tamper-evident chain from commit to production. Policy-as-code controls, automated evidence collection, and notifications address deviations, while runtime monitoring can identify artifacts with unknown provenance and provide time-machine forensics for environment changes. Kosli lists integrations including GitHub, Bitbucket, GitLab, CircleCI, Jenkins, Microsoft Azure, TeamCity, Terraform, Ansible, Datadog, New Relic, Jira, ServiceNow, Slack, and Email. It supports SaaS, single-tenant AWS hosting, and on-premises Enterprise deployment. The platform runs through API, Linux, macOS, self-hosted, web, and Windows. Pricing is available on request.

Sigstore is a free, open source project for signing and verifying software artifacts to improve supply chain security. It supports release files, container images, binaries, software bills of materials, and more. Signatures use temporary keys, so developers do not have to manage signing keys; events are recorded in a tamper-resistant public log for audit. Its components include Cosign, Fulcio, Rekor, OpenID Connect, and Policy Controller. Cosign signs and verifies artifacts and stores signatures in an OCI registry. Fulcio issues temporary certificates to authorized identities, while Rekor keeps signed metadata in a searchable ledger. OpenID Connect authenticates users through providers such as GitHub and Google. The trust root uses The Update Framework and is maintained by five keyholders from different companies and academic institutions. Sigstore provides GitHub Actions, documents GitLab CI installation, and offers official clients for Go, Java, JavaScript, Python, Ruby, and Rust. It supports API, Linux, macOS, Windows, and self-hosted environments. One integration caveat is that Cosign has no API stability guarantees, does not follow semantic versioning, and is not recommended for application integration because of its dependencies.