{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "537944538",
    "entityType": "User",
    "nonce": "0xe7de7227e9ca4cb72e290036cb41fb1de10af4dd7b66105a1748342081b20b21",
    "signature": "0x3d16c5d60c7e6546e484c7a610b1e3e7b25b4e9a227f0a23155bbff564f5f0d455e64e661c849ba3c0ab7757472fe56ffaf099d6340f73ec7e13ff63b087bfee1c",
    "signer": "0x16D3bf5a80bAfFB2f1550d49b1203D4CA532DA1C",
    "userId": "1994482"
  }
}