{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x6772387b5e9b0e6260e8dde63bf7fc437c4bf6b55555e07f1365a121cab342ad",
    "signature": "0x0516846b05044e37cbbd8ef6c775d6cfbb3ebcdd89ca418fae8d4a415b6c878b76b3ca01727acf7696dcdfbfc956b01376cb39b34955d44f8e43ab821d8ef0f21c",
    "signer": "0x428d64088Cec8684502aAcBB5EE93309E5E093E3",
    "userId": "542343021"
  }
}