type `MintCondition`

`common.MintCondition`

Field	Type	Description
issuer	string	Public key of the issuer
distribution	Distribution	Sum must match corresponding amount in the commitment

{
  "issuer": "zIssuerPublicKey",
  "distribution": {
    "value": [
      {
        "key": 20,
        "value": 2
      }
    ]
  }
}