{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "3407",
    "entityType": "User",
    "nonce": "0x0de8e6012bac9bc303f23eb4c9f54e2c96e31c08cf6853533fb37a274d5be3a4",
    "signature": "0xb7e37165b27226b15598b8d31c6108e04c7a573a8d1187add60549b3a19684135e26f3e9504b32ba9fe38f0543de804ad86d87b353825c206e85c7f390b50a1c1b",
    "signer": "0x14647618553BB8A26AceAE7C85dB5b376300dA8F",
    "userId": "999002860"
  }
}