{
  "type": "object",
  "title": "CoinbaseTransactionMetadata",
  "description": "Describes representation of a Type 3 Stacks 2.0 transaction: Poison Microblock",
  "required": ["tx_type", "coinbase_payload"],
  "additionalProperties": false,
  "properties": {
    "tx_type": {
      "type": "string",
      "enum": ["coinbase"]
    },
    "coinbase_payload": {
      "type": "object",
      "additionalProperties": false,
      "required": ["data"],
      "properties": {
        "data": {
          "type": "string",
          "description": "Hex encoded 32-byte scratch space for block leader's use"
        },
        "alt_recipient": {
          "type": "string",
          "nullable": true,
          "description": "A principal that will receive the miner rewards for this coinbase transaction. Can be either a standard principal or contract principal. Only specified for `coinbase-to-alt-recipient` transaction types, otherwise null."
        },
        "vrf_proof": {
          "type": "string",
          "nullable": true,
          "description": "Hex encoded 80-byte VRF proof"
        }
      }
    }
  }
}