{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://accordprotocol.ai/schemas/verification-receipt.v0.schema.json",
  "title": "Accord Verification Receipt v0",
  "description": "Verifier's signed verdict on whether a seller's work meets the Agreement terms. See specs/ACCORD-002-verification-receipt.md.",
  "type": "object",
  "required": [
    "type",
    "version",
    "receipt_id",
    "agreement_id",
    "agreement_hash",
    "verifier",
    "result",
    "evidence",
    "created_at",
    "signature"
  ],
  "additionalProperties": true,
  "propertyNames": { "not": { "pattern": "^accord_" } },
  "properties": {
    "type": { "const": "accord.verification_receipt.v0" },
    "version": { "const": "v0" },
    "receipt_id": {
      "type": "string",
      "pattern": "^vr_[0-9A-HJKMNP-TV-Z]{26}$"
    },
    "agreement_id": {
      "type": "string",
      "pattern": "^acc_[0-9A-HJKMNP-TV-Z]{26}$"
    },
    "agreement_hash": { "$ref": "#/$defs/blake2b256_hash" },
    "verifier": {
      "type": "object",
      "required": ["id"],
      "additionalProperties": true,
      "properties": {
        "id": {
          "type": "string",
          "pattern": "^(verifier|agent|human)://"
        },
        "wallet": {
          "type": "string",
          "pattern": "^(ergo|eth|base|rosen):"
        }
      }
    },
    "result": {
      "type": "string",
      "enum": ["accepted", "rejected", "partial", "disputed"]
    },
    "evidence": {
      "type": "object",
      "required": ["output_hash"],
      "additionalProperties": true,
      "properties": {
        "output_hash": {
          "type": "string",
          "pattern": "^(blake2b256|keccak256|sha256):0x[0-9a-f]{64}$"
        },
        "output_ref": { "type": "string" },
        "schema": { "type": "string" }
      }
    },
    "checks": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["name", "result"],
        "additionalProperties": false,
        "properties": {
          "name": { "type": "string", "pattern": "^[a-z][a-z0-9_]*$" },
          "result": {
            "type": "string",
            "enum": ["pass", "fail", "skip", "inconclusive"]
          },
          "detail": { "type": "string" }
        }
      }
    },
    "created_at": { "$ref": "#/$defs/iso8601_utc" },
    "signature": { "$ref": "#/$defs/signature" }
  },
  "$defs": {
    "iso8601_utc": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}Z$"
    },
    "blake2b256_hash": {
      "type": "string",
      "pattern": "^blake2b256:0x[0-9a-f]{64}$"
    },
    "signature": {
      "type": "object",
      "required": ["scheme", "public_key", "signature"],
      "additionalProperties": false,
      "properties": {
        "scheme": {
          "type": "string",
          "enum": ["ed25519", "secp256k1", "ergo-sigma"]
        },
        "public_key": { "type": "string", "pattern": "^0x[0-9a-f]+$" },
        "signature": { "type": "string", "pattern": "^0x[0-9a-f]+$" }
      }
    }
  }
}