{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "54123",
    "entityType": "User",
    "nonce": "0xa835f3993832ef4bc7acc381189ebd964816256ecefb9fb71530ac529138b489",
    "signature": "0x76c88a525ba66129eedf7e9015e5ba52738a83ae4b02364807ba38cdbe6bcbc317ae558f45d0af45c46a2f70dbc532aada10799367a053de426d71bcf51134d51b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}