Attestations for
  ghcr.io/boks-sh/yarn@sha256:5277222f3e37c8252e3771bb7a2544ac5408c60b21722faf58b469024a0f8b73

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/yarn@sha256:5277222f3e37c8252e3771bb7a2544ac5408c60b21722faf58b469024a0f8b73

=== 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)