{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schema.keysingate.com/core/v2/class-promotion.json",
  "title": "ClassPromotion - a raise of one container's class (core v2 section 8.7)",
  "description": "Upward only: bare < light < heavy. Signed by two different parties, the issuer and the holder. A container that could quietly claim a higher class would be claiming anchors it never had, so the raise is a signed act and not a field the holder edits. The schema checks the shape; that `to` is above `from` and that `from` is the class the container holds now is checked by the verifier.",
  "type": "object",
  "properties": {
    "@context": {
      "$ref": "common.json#/$defs/context"
    },
    "type": {
      "const": "ClassPromotion"
    },
    "v": {
      "$ref": "common.json#/$defs/version"
    },
    "container": {
      "description": "The container being raised: its identifier, not its serial.",
      "$ref": "common.json#/$defs/multihash"
    },
    "from": {
      "$ref": "#/$defs/class"
    },
    "to": {
      "$ref": "#/$defs/class"
    },
    "offset_ms": {
      "description": "Milliseconds since the packet's origin (KS-2).",
      "$ref": "common.json#/$defs/safe_uint"
    },
    "signatures": {
      "description": "At least two: the issuer's and the holder's.",
      "$ref": "common.json#/$defs/signatures",
      "minItems": 2
    }
  },
  "required": [
    "@context",
    "type",
    "v",
    "container",
    "from",
    "to",
    "offset_ms",
    "signatures"
  ],
  "additionalProperties": false,
  "not": {
    "properties": {
      "from": {
        "const": "heavy"
      }
    },
    "required": [
      "from"
    ]
  },
  "$defs": {
    "class": {
      "enum": [
        "bare",
        "light",
        "heavy"
      ]
    }
  }
}