{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "490902198",
    "entityType": "User",
    "nonce": "0x519b8ccf0287b20df023ff04acb6067c6bf9acdd64fb4e3d044c9a88282ed53c",
    "signature": "0xa7cd4f5a9498f26d85c28d881c6a69c1668ba20eb0270c7d69c7fff37b55b83503ca5f78caf0849b4195c78dcbc0c7d64bc57794bed5203c804e3f4e5e53cabc1c",
    "signer": "0x5EbCE600b54E0129997395991AC72BE65BB674AA",
    "userId": "843653281"
  }
}