{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://timelordraps.github.io/verifier/schemas/vstd-silo-composition-0.1.schema.json",
  "title": "Verifier Standard (VSTD) experimental silo composition declaration",
  "description": "Exact member commit coordinates and an optional composite commit coordinate; declaration alone is not composition evidence.",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema_version", "member_commit_digests", "composite_commit_digest"],
  "properties": {
    "schema_version": {"const": "VSTD-SILO-COMPOSITION-0.1"},
    "member_commit_digests": {
      "type": "array",
      "minItems": 1,
      "maxItems": 256,
      "uniqueItems": true,
      "items": {"type": "string", "pattern": "^sha256:[0-9a-f]{64}$"}
    },
    "composite_commit_digest": {
      "oneOf": [
        {"type": "string", "pattern": "^sha256:[0-9a-f]{64}$"},
        {"type": "null"}
      ]
    }
  }
}