{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x8ec087acbf81012b9632c226601780bc34f85d3c01643cc6363d2580a43083ed",
    "signature": "0xa44c748266f68f9faceafa0c47b26b3f062ec25389d20c53cca4f4b2819ec85862d9c09726bf396daa3047de3361a2e49b4c124bd488c09073d3e72bd7b0c4561c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}