{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "578849678",
    "entityType": "User",
    "nonce": "0x7d92f23e9a3f5943340f063c2892efbde61d8664f4bb68e4030be710dbaa8b81",
    "signature": "0x20bdcc4f8840058c99e4395b733c1a08c197166953d7bdf167a0549ae153b9af29beafbb1a8ca2d35e27fe0e52013a2a58aafa4120beeced69b494a25bbfc6451b",
    "signer": "0x87FC3581f96D45b347BB39E15f25079950C5Cc27",
    "userId": "339826419"
  }
}