{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://trustgraduation.org/spec/0.1/receipt.schema.json",
  "title": "Trust Graduation Receipt",
  "description": "Receipt for approval, refusal, correction, or execution. Trust Graduation Protocol v0.1.",
  "type": "object",
  "required": ["type", "receipt_id", "action_class", "outcome", "created_at"],
  "additionalProperties": true,
  "properties": {
    "type": { "const": "trust_graduation_receipt" },
    "receipt_id": {
      "type": "string",
      "minLength": 1
    },
    "action_class": {
      "type": "string",
      "pattern": "^[a-z][a-z0-9]*(\\.[a-z][a-z0-9]*)+$"
    },
    "outcome": {
      "type": "string"
    },
    "external_action_executed": {
      "type": "boolean"
    },
    "human_approved": {
      "type": "boolean"
    },
    "created_at": {
      "type": "string",
      "format": "date-time"
    },
    "prev_hash": {
      "type": "string",
      "description": "Previous receipt hash for append-only chain verification."
    },
    "content_hash": {
      "type": "string",
      "description": "Hash commitment to canonical receipt content."
    },
    "redacted_for": {
      "type": "string",
      "description": "Reason content was removed while preserving audit continuity."
    }
  }
}