Attestations for
  ghcr.io/boks-sh/grep@sha256:1bc11b946232a39ec1a7446c952fe2f257058d3401578ac94000f39af25c9410

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/grep@sha256:1bc11b946232a39ec1a7446c952fe2f257058d3401578ac94000f39af25c9410

=== cyclonedx ===================================================
  (no attestation matches the document published now -- 1 older one(s) are attached)

=== slsaprovenance ==============================================
  (no attestation matches the document published now -- 1 older one(s) are attached)