{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://edut.ai/schemas/evidence-receipt.v1.schema.json",
  "title": "EDUT Evidence Receipt Schema v1",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version",
    "receipt_id",
    "event_type",
    "wallet",
    "timestamp",
    "hash"
  ],
  "properties": {
    "schema_version": {
      "type": "string",
      "const": "evidence_receipt.v1"
    },
    "receipt_id": {
      "type": "string"
    },
    "event_type": {
      "type": "string",
      "enum": [
        "membership_mint",
        "membership_confirm",
        "offer_checkout_quote",
        "offer_checkout_confirm",
        "entitlement_mint",
        "entitlement_state_change"
      ]
    },
    "wallet": {
      "type": "string",
      "pattern": "^0x[a-fA-F0-9]{40}$"
    },
    "designation_code": {
      "type": ["string", "null"]
    },
    "offer_id": {
      "type": ["string", "null"]
    },
    "quote_id": {
      "type": ["string", "null"]
    },
    "entitlement_id": {
      "type": ["string", "null"]
    },
    "tx_hash": {
      "type": ["string", "null"],
      "pattern": "^0x[a-fA-F0-9]{64}$"
    },
    "chain_id": {
      "type": ["integer", "null"],
      "minimum": 1
    },
    "policy_hash": {
      "type": ["string", "null"],
      "pattern": "^[a-fA-F0-9]{64}$"
    },
    "timestamp": {
      "type": "string",
      "format": "date-time"
    },
    "hash": {
      "type": "string",
      "pattern": "^[a-fA-F0-9]{64}$"
    }
  }
}