{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0xe6a5eefe4f3a463685a5985207db8ded35add12a58ae7829210ce8e4b91c4bb2",
    "signature": "0x8ef1bd04aa0b504c7604b35ee88df7d947d0407b84c11c170cbeb2f51d2c7acd587a48b5467e7fd9dfb0b32be74cf75c912ce896e63f2c1fcc1b6356ec6ed3ea1b",
    "signer": "0xb15d7053c985Edf1d74fFc9893ab67Fdc2B33090",
    "userId": "211545300"
  }
}