{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "urn:orbiplex:schema:artifact-mailbox-sealed:v1",
  "title": "Artifact Mailbox Sealed Transport Envelope v1",
  "description": "Transport-only Matrix mailbox envelope for store-and-forward Artifact Delivery / INAC messages. Matrix is the carrier, not authority; receivers unseal and revalidate the embedded control frame before admission.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema",
    "source/adapter",
    "sender/node-id",
    "recipient/node-id",
    "control/schema",
    "payload/security",
    "sealed/payload"
  ],
  "properties": {
    "schema": { "const": "artifact-mailbox-sealed.v1" },
    "source/adapter": { "const": "daemon.matrix-mailbox" },
    "sender/node-id": { "type": "string", "pattern": "^node:did:key:.+" },
    "recipient/node-id": { "type": "string", "pattern": "^node:did:key:.+" },
    "control/schema": { "const": "inac-control.v1" },
    "payload/security": { "const": "sealed" },
    "sealed/payload": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "schema",
        "alg",
        "sender/node-id",
        "recipient/node-id",
        "nonce/base64url",
        "ciphertext/base64url"
      ],
      "properties": {
        "schema": { "const": "artifact-mailbox-sealed-payload.v1" },
        "alg": { "const": "node-static-x25519+a256gcm" },
        "sender/node-id": { "type": "string", "pattern": "^node:did:key:.+" },
        "recipient/node-id": { "type": "string", "pattern": "^node:did:key:.+" },
        "nonce/base64url": { "type": "string", "pattern": "^[A-Za-z0-9_-]+$" },
        "ciphertext/base64url": { "type": "string", "pattern": "^[A-Za-z0-9_-]+$" }
      }
    }
  }
}