{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false,
  "properties": {
    "name": {
      "pattern": "^sha256:[0-9a-f]{64}$",
      "type": "string"
    },
    "size": {
      "pattern": "^(0|[1-9][0-9]*)$",
      "type": "string"
    },
    "stored_at": {
      "format": "date-time",
      "type": "string"
    }
  },
  "required": [
    "name",
    "size",
    "stored_at"
  ],
  "type": "object"
}