{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "542613447",
    "entityType": "User",
    "nonce": "0x01f78d4680bb6681a5de88426843e70966250437feaf58ec9072b3a79fe8a552",
    "signature": "0xc4cb3e4d1e310d470c80606ceb16cd902452decb55279a120e4b66425e26abe520f7ea852b864b501ffbb25e6c23a8c0cb40fa964e1a0e6061a569526cf538b51b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}