{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "ItemHistory",
  "type": "object",
  "properties": {
    "owner": {
      "$ref": "#/components/schemas/UnionAddress"
    },
    "contract": {
      "$ref": "#/components/schemas/ContractAddress"
    },
    "tokenId": {
      "$ref": "#/components/schemas/BigInteger"
    },
    "value": {
      "$ref": "#/components/schemas/BigInteger"
    },
    "date": {
      "type": "string",
      "format": "date-time"
    }
  },
  "description": "History of item",
  "required": [
    "contract",
    "tokenId",
    "date"
  ],
  "oneOf": [
    {
      "$ref": "#/components/schemas/ItemRoyalty"
    },
    {
      "$ref": "#/components/schemas/ItemTransfer"
    }
  ]
}