{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "221875563",
    "entityType": "User",
    "nonce": "0x66b6a7d21438e6c10b20b365365ca9665ad116acf6def7298563dd5644fff421",
    "signature": "0xad4547b1110b9c6bd03597e6f328544a04aaabe36f3a10e29c5769731c18b4c27e0668b9a85f711a7f32bd316a32464a4e5ff143d62a94d515f9cab914c3b30b1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}