{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "258421",
    "entityType": "User",
    "nonce": "0x2f7d207491f5097b1cff8ab0e26f8aa15e4a0302009688378493e43fab26ec46",
    "signature": "0x39baa07de871221eeb70dcdf6e78c97bb97d0894337566da05dd3019d04333d268858cbda67965654cc6a97d31cbd0d45ddd76c7321e0bb2035ecd8faaa336b21c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}