{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://rootz.global/schemas/ask-orders/checkpoint.schema.json",
  "title": "ASK Orders checkpoint \u2014 a signed RFC 9162 tree head of one session log",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "body",
    "proofs"
  ],
  "properties": {
    "body": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "kind",
        "log_id",
        "tree_size",
        "root",
        "at",
        "signer",
        "previous"
      ],
      "properties": {
        "kind": {
          "const": "ask-orders.checkpoint.v1"
        },
        "log_id": {
          "type": "string",
          "pattern": "^[A-Za-z0-9_-]{16,64}$"
        },
        "tree_size": {
          "type": "integer",
          "minimum": 1
        },
        "root": {
          "$ref": "common.schema.json#/$defs/Digest"
        },
        "at": {
          "$ref": "common.schema.json#/$defs/Time"
        },
        "signer": {
          "type": "object",
          "additionalProperties": false,
          "required": [
            "kid",
            "binding",
            "evidence"
          ],
          "properties": {
            "kid": {
              "type": "string",
              "minLength": 1,
              "maxLength": 200
            },
            "binding": {
              "enum": [
                "none",
                "tpm2-certified",
                "tee-report",
                "secure-enclave"
              ]
            },
            "evidence": {
              "oneOf": [
                {
                  "$ref": "common.schema.json#/$defs/Digest"
                },
                {
                  "type": "null"
                }
              ]
            }
          }
        },
        "previous": {
          "oneOf": [
            {
              "type": "null"
            },
            {
              "type": "object",
              "additionalProperties": false,
              "required": [
                "tree_size",
                "root"
              ],
              "properties": {
                "tree_size": {
                  "type": "integer",
                  "minimum": 1
                },
                "root": {
                  "$ref": "common.schema.json#/$defs/Digest"
                }
              }
            }
          ]
        },
        "route": {
          "$ref": "common.schema.json#/$defs/Route"
        }
      }
    },
    "proofs": {
      "$ref": "common.schema.json#/$defs/Proofs"
    }
  }
}