{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0xb7300c8cffe1e7e6978132363f7a9cda4d3a7ca42472358a8fb559b484a85045",
    "signature": "0xd358cd9bd852494d282e1d4d2c006d6f0a6aa6bade034e9b43347479430570163e9f87d6f1748dad73d5f4924763b2ada9f295ed3589ad4c95b113f49bf2d4d51b",
    "signer": "0x257c9f4A9563d6A4a2bF3be7Da1738e167fcF295",
    "userId": "301719964"
  }
}