{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "506789556",
    "entityType": "User",
    "nonce": "0x9963e149c83352b441956842190eb77fadb5b537506e3bca207de09c052e5083",
    "signature": "0xcd28a020d57c1fc29c7015a19705d1fd92d81b423c8247d1e7649097ba92785f042e871ca08261f5c7fbce768df2f5f59547e46fab0def85fa71c0541c865c3b1b",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}