server@51074ee5cd2c
docker buildx stores the attestations it generates as an extra entry of the index, with the placeholder platform unknown/unknown, describing the variant d21511a82e52. It appears whenever a build records provenance — on by default since Docker 24 / buildx 0.11 — or an SBOM (--sbom=true); images built with plain docker build or with --provenance=false have no such entry. docker pull never fetches it by itself; docker buildx imagetools inspect and docker sbom read it.
This entry contains: SLSA provenance v1 (26.4 KiB) — no SBOM: the build did not pass --sbom=true.
It belongs to server:0.7, server:0.7.5, server@38998d61a3fe, so it cannot be deleted on its own: removing it would break that index. Delete the tag or the index and the next prune untagged run (or a retention policy) removes this entry; garbage collection reclaims its bytes.
To build without attestation entries: docker buildx build --provenance=false --sbom=false …
docker pull chicor.ee/tund/server@sha256:51074ee5cd2c1739c4c81a66e653a0e7fdc7dd79830beadf9057fbbf406b4b46- Digest
- 51074ee5cd2c1739c4c8
- Media type
- application/vnd.oci.image.manifest.v1+json
- Platform
- none — attestation entry (unknown/unknown)
- Total size
- 26.4 KiB
- Pushed
- Oct 6, 2026byGitHub Actions · tund/github-ci
| # | Instruction | Digest | Shared | Size |
|---|---|---|---|---|
| 1 | — | 3c5f73f32b99 | unique | 26.4 KiB |
Nothing is attached to this image.
Signatures, SBOMs and provenance show up here once someone who can push attaches them.
{
"schemaVersion": 2,
"mediaType": "application/vnd.oci.image.manifest.v1+json",
"artifactType": "application/vnd.docker.attestation.manifest.v1+json",
"config": {
"mediaType": "application/vnd.oci.empty.v1+json",
"digest": "sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a",
"size": 2,
"data": "e30="
},
"layers": [
{
"mediaType": "application/vnd.in-toto+json",
"digest": "sha256:3c5f73f32b992e5d17724b6dcdfb247bcd8afed872794dab2b21c5bcd8b8f62f",
"size": 27050,
"annotations": {
"in-toto.io/predicate-type": "https://slsa.dev/provenance/v1"
}
}
],
"subject": {
"mediaType": "application/vnd.oci.image.manifest.v1+json",
"digest": "sha256:d21511a82e52825d30b8fc59f2ab893e99b6b114e924bfde295184d09e24ebc0",
"size": 1056
}
}