{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x5b19daaab2d24641705db99f1fe9c29b60e571bdbf21552caae8eb2a3db17402",
    "signature": "0x7c75fa64d8e1de3ab4a632ea1658bb0cb291940826f5dc463e989364c5df10746d6c28adceda509b2a01c25823fbf40f861996e76dd4df86962b6c8a3504534d1c",
    "signer": "0x7FCffbc9FB7516A6453F59c5b9918Ea8A7EB33eb",
    "userId": "502388335"
  }
}