Attestations for
  ghcr.io/boks-sh/gzip@sha256:9f70c5a7658ab947edb2259e21004093299f1cc3046c0e214f9e4c3e1af8e866

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/gzip@sha256:9f70c5a7658ab947edb2259e21004093299f1cc3046c0e214f9e4c3e1af8e866

=== cyclonedx ===================================================
  (no attestation matches the document published now -- 0 older one(s) are attached)

=== slsaprovenance ==============================================
  (no attestation matches the document published now -- 0 older one(s) are attached)