{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "215993",
    "entityType": "User",
    "nonce": "0x20ed4b929be8a6d1a3b0bb430eda8bb90eb77d71d33dea985ca2f75256aba985",
    "signature": "0x8728db59ff3b290a85e0ad409fce953022bf67da4b76cfb3fde07e5dd88d32e5333c9fb512717eb18eac9d85f88a38328dc13e6ddafb59bef4f8b9b9c9d6d8fc1b",
    "signer": "0x19EDB4c1a8740c323f6e57B80F3422C01875289e",
    "userId": "390804"
  }
}