{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "648802251",
    "entityType": "User",
    "nonce": "0xae74e7eb06041ca2943d50f630ba5ef6346ff92c48bb901551ed470b076855c6",
    "signature": "0xcda304fce5a1d776c4ccac3ec8633321d7e7ad479e019fb31ca321b2b1b20e07258e9513ce18e5e04e2fb70348fb27ac48bfd39a18973cae815b63cc1923411b1c",
    "signer": "0xfB6436C438F897b7eA739876B4Cfcca832868820",
    "userId": "512354652"
  }
}