{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schema.keysingate.com/core/v2/binding.json",
  "title": "AgentBinding - a one-time binding of a block to an agent key (Section 8)",
  "description": "A block has EXACTLY ONE binding; a second one is invalid - this makes the block non-reincarnatable and a stolen form useless. Uniqueness cannot be derived from a single document and is checked separately. agent.key proves continuity, not identity: anyone can generate a key.",
  "type": "object",
  "properties": {
    "@context": {
      "$ref": "common.json#/$defs/context"
    },
    "type": {
      "const": "AgentBinding"
    },
    "v": {
      "$ref": "common.json#/$defs/version"
    },
    "emission": {
      "type": "string",
      "pattern": "^ksg:em:[0-9]+$"
    },
    "block": {
      "$ref": "common.json#/$defs/range"
    },
    "agent": {
      "$ref": "common.json#/$defs/key"
    },
    "bound_at": {
      "$ref": "common.json#/$defs/timestamp"
    },
    "signatures": {
      "description": "Signed by the agent itself: no contact with the issuer is required at binding time.",
      "$ref": "common.json#/$defs/signatures"
    }
  },
  "required": [
    "@context",
    "type",
    "v",
    "emission",
    "block",
    "agent",
    "bound_at",
    "signatures"
  ],
  "additionalProperties": false
}