# OCI Referrer-Based Artifact Association

## Module
Cli

## Status
IMPLEMENTED

## Description
OCI referrer-based attachment of SBOMs, attestations, and verdicts to image digests using the OCI referrers API, with discovery, publishing, and fallback mechanisms.

## Implementation Details
- **OCI Registry Client**: `src/Cli/StellaOps.Cli/Services/OciRegistryClient.cs` / `IOciRegistryClient.cs` -- OCI registry operations including referrers API
- **OCI Attestation Registry**: `src/Cli/StellaOps.Cli/Services/OciAttestationRegistryClient.cs` -- attestation-specific OCI operations
- **Commands**:
  - `stella oci-list <digest>` -- list OCI referrers for an image digest
  - `stella oci-verify <digest>` -- verify OCI-attached attestations
- **Architecture**: Uses OCI referrers API (fallback to tag-based discovery for older registries)

## E2E Test Plan
- [ ] Run `stella oci-list sha256:abc123` and verify referrers listed (SBOMs, attestations, verdicts)
- [ ] Run `stella oci-verify sha256:abc123` and verify attached attestation verification
- [ ] Verify fallback to tag-based discovery when referrers API unavailable
- [ ] Verify SBOM attachment discovery and content retrieval
- [ ] Verify `--format json` output