{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "301637",
    "entityType": "User",
    "nonce": "0x1b66c7a236a44e5a9dd27895fb652bbd99a23d8cdd55ef0d3f088d04aa3a1621",
    "signature": "0x75c7ba7caa9edb4b1b15fc8010ba6697d01b8d942fff2de17f10daf9e79358c334aea5ed56bdbbb3c57b5bb6ffe9cb27c588c231e260c7238a6074ff0ac4da0c1c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}