Attestations for
  ghcr.io/boks-sh/which@sha256:b6288be37530651df9e6a0af3a69070f15eee7c1293d5e1fe9eb5b0809d8502e

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/which@sha256:b6288be37530651df9e6a0af3a69070f15eee7c1293d5e1fe9eb5b0809d8502e

=== 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)