{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "124",
    "entityType": "User",
    "nonce": "0x781ad97d1393fea306d91cff3669cad8e4237f2b2f559ee40251141b841c7cfe",
    "signature": "0xc9cc1f4f9e92e7ca355668357eb0d76fd1d8d36f1d3eddce95fe1cd14db1a8ec5e812f63f15cfa5d620c8fafdbc5c5e08ebc4484d51637825a165d09b6f4d8231c",
    "signer": "0x9436FA87F6c8C3aa9e0F0fc7960566dEeB9e23d4",
    "userId": "390992303"
  }
}