{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "502388335",
    "entityType": "User",
    "nonce": "0xf765e7e917ccca6ffa2f98e0ab585f84a30c97a75f6149b22892d6224a7946b6",
    "signature": "0xf4f87f481024683c8471e392d76d1019817c61cf15c59b45b20a542ae56d4354643e97db59035902af148ebd833cbe6160962a4c8c063342381754fa6793b5be1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}