{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x660756619003ffdcfbe141a1a5cad82357624a28b161debdbf3d2aa711a3823a",
    "signature": "0x5c328d04290ef53db569a05d7e0c22e1b81ae0d3226e1096d4991ec7e508fc2f1ace5943bf1b4cf833ab218928cb8fb1574509249082ad51554371736365d7181c",
    "signer": "0x748ccCc8022091F8C1B32Ca32f2AeEeC66CaEbC4",
    "userId": "757509215"
  }
}