{
  "types": {
    "CIP23Domain": [
      { "name": "name", "type": "string" },
      { "name": "version", "type": "string" },
      { "name": "chainId", "type": "uint256" },
      { "name": "verifyingContract", "type": "address" }
    ],
    "Person": [
      { "name": "name", "type": "string" },
      { "name": "mother", "type": "Person" },
      { "name": "father", "type": "Person" }
    ]
  },
  "domain": {
    "name": "Family Tree",
    "version": "1",
    "chainId": 1,
    "verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
  },
  "primaryType": "Person",
  "message": {
    "name": "Jon",
    "mother": { "name": "Lyanna", "father": { "name": "Rickard" } },
    "father": { "name": "Rhaegar", "father": { "name": "Aeris II" } }
  }
}