Attestations for
  ghcr.io/boks-sh/black@sha256:f6307eb76f70915f351fb7a310e0b753c0612d8d21ae6d0d756dffd9f5841302

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/black@sha256:f6307eb76f70915f351fb7a310e0b753c0612d8d21ae6d0d756dffd9f5841302

=== cyclonedx ===================================================
  (no attestation matches the document published now -- 2 older one(s) are attached)

=== slsaprovenance ==============================================
  (no attestation matches the document published now -- 2 older one(s) are attached)