{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "421",
    "entityType": "User",
    "nonce": "0x621f83c4aa07784cded90534fc868299ad63051f2df4c002cd0e6befc0e02ff2",
    "signature": "0x641d399928d9a125f66d23516370560ebad8c259c7b00c6d2faaefb394006b220ddf01ac716ae0ae3a4a597145f5ac5230069072ba603dba5c3b8757f31dc5001c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}