{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://forms.takoform.com/schemas/v1/form-package-revocation-checkpoint.schema.json",
  "title": "Takoform cumulative Form Package revocation checkpoint v1",
  "description": "A cumulative, signed revocation checkpoint. Sequence zero with checkpointVersion 0.0.0 is the only empty state and is the genesis of every new v1 chain.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "apiVersion",
    "kind",
    "checkpointVersion",
    "sequence",
    "previousCheckpointDigest",
    "entries"
  ],
  "properties": {
    "apiVersion": {
      "const": "trust.forms.takoform.com/v1"
    },
    "kind": {
      "const": "FormPackageRevocationCheckpoint"
    },
    "checkpointVersion": {
      "$ref": "#/$defs/semver"
    },
    "sequence": {
      "type": "integer",
      "minimum": 0
    },
    "previousCheckpointDigest": {
      "oneOf": [
        { "type": "null" },
        { "$ref": "#/$defs/digest" }
      ]
    },
    "entries": {
      "type": "array",
      "maxItems": 100000,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "statementApiVersion",
          "sequence",
          "statementVersion",
          "statementDigest",
          "packageDigest",
          "formRef"
        ],
        "properties": {
          "statementApiVersion": {
            "const": "trust.forms.takoform.com/v1"
          },
          "sequence": {
            "type": "integer",
            "minimum": 1
          },
          "statementVersion": {
            "$ref": "#/$defs/semver"
          },
          "statementDigest": {
            "$ref": "#/$defs/digest"
          },
          "packageDigest": {
            "$ref": "#/$defs/digest"
          },
          "formRef": {
            "$ref": "https://forms.takoform.com/schemas/v1/form-ref.schema.json"
          }
        }
      }
    }
  },
  "allOf": [
    {
      "if": {
        "properties": {
          "sequence": { "const": 0 }
        },
        "required": ["sequence"]
      },
      "then": {
        "properties": {
          "checkpointVersion": { "const": "0.0.0" },
          "previousCheckpointDigest": { "type": "null" },
          "entries": { "maxItems": 0 }
        }
      },
      "else": {
        "properties": {
          "checkpointVersion": { "not": { "const": "0.0.0" } },
          "previousCheckpointDigest": { "$ref": "#/$defs/digest" },
          "entries": { "minItems": 1 }
        }
      }
    }
  ],
  "$defs": {
    "digest": {
      "type": "string",
      "pattern": "^sha256:[0-9a-f]{64}$"
    },
    "semver": {
      "type": "string",
      "pattern": "^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9A-Za-z-]*[A-Za-z-][0-9A-Za-z-]*)(\\.(0|[1-9][0-9]*|[0-9A-Za-z-]*[A-Za-z-][0-9A-Za-z-]*))*))?(\\+([0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*))?$"
    }
  }
}