{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "504451367",
    "entityType": "User",
    "nonce": "0x943cd6b90945e1128e2b66d5088fbbb2977b32b874c52401bb22c56384334060",
    "signature": "0xbc01b2d10d0172801b5e68c10373344717465554c4f7fe96cf2b88e206a796985c214c6f176e5c88847e5d788335601894893ee42ef18ba26bc37c717d7e07c41b",
    "signer": "0xcd864e8A0A043bf1B2DA4106C35c1daF234468a5",
    "userId": "784246910"
  }
}