{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "16416",
    "entityType": "User",
    "nonce": "0x66ff3ba60c6cdec832940d0255fb525dd4d25f8a42798436ac94002ddc122bac",
    "signature": "0x5047a5de231327e077aa926b512e4f203d5b5b88b420fd27095356564820664c5a627f2be3c813f87f866c8ff73e60206f4457cdd5a4afb1ef52e464f29ee4531c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}