{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "643822403",
    "entityType": "User",
    "nonce": "0x0d959c542910c0bac378460576bdad408350ea5662890eaec29acca27080209e",
    "signature": "0xea1571046a5f8aa525424bca4b91a5c3e79b36c20e23b9712614694a14c9b50c7a45f30a66b49033d355fe4a623fe3d13a1416b34e25a6209f9b7b1049df740e1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}