{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x7d591ed5fba42c4386b4a286c2fed2d65ca8d108e8454db3048135dcc2f66805",
    "signature": "0x29310d588038ca8f292660e6b08f4218fded247a1b6713f87ca96ac3f7c41f665f24c81f122166c200f08b99431e576a42cbb52cfe91f0228ad68c82706709631c",
    "signer": "0xDC9FB11483106d427BaC29ff4bf0E03f11b4e19E",
    "userId": "5500"
  }
}