{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "678556080",
    "entityType": "User",
    "nonce": "0x76596c202077cb1ad4da55af3ef1e2d01c6e7fdff1dcda3969829364484e619c",
    "signature": "0x1921b39e1cbeb99c817cff737b3624ac39a17e2edbc3f031c5514dbfeec97e9e19973911b38a845d15fd8e7b97f285fb92d55d52e275187639385a766b206b3f1c",
    "signer": "0xfC070d9d02c152146e3D1B2cD4B03FD7a3CA1AB0",
    "userId": "539537193"
  }
}