{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0xe474ed05bd0cac9a8c1b9c5cf284fbfa743f196f3752a5aefe3cc281828724d9",
    "signature": "0x6cf15a8aa03599bccada1aafe538a38aa1ec6969cbb4011be3961c850e47867177874413e8774b3f00f6da2d74d7b7cfbafc8fa41fa3c088a5c56ee33a72d9181c",
    "signer": "0x621C1ffd4F2D9c750A93330767C1252dBa68Ec3A",
    "userId": "187371220"
  }
}