{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "640720364",
    "entityType": "User",
    "nonce": "0x2f60cc707a546c16c33e6a01a11ed9b982e0c4598daa719d1e0caed610c4de15",
    "signature": "0x5252f74bfa0a066439cafe980d4573b004f5e5d3e38913e9222ea6b0c222c51c02b13bf27dae9ac1779b398aca1f2cb1d3d97e9dee5079329d0f6782fecc424b1c",
    "signer": "0x4df845f0a31d75ecdeF1019e502eCEBCb209BE06",
    "userId": "742768859"
  }
}