{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x637d042c253b62382daef24588b580242ae3b3aea790a4c0d3e54953be3dffe5",
    "signature": "0xa2c385579798024ceb896cc3888b80b2204ae181e9c5d08d1f287e6262d5a47f5afb244a35c4316771bfd3d72f47b59e6bad6f166205462d9fc825e618026e781c",
    "signer": "0x50f6CF4Abb23DF8B26e12391A5C15e82F15d7Cc0",
    "userId": "644846042"
  }
}