{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "512214950",
    "entityType": "User",
    "nonce": "0x2ff07b2ed47f4a5ed9b6b23a69ccaec56d54f29e9fd3818561c58833d58429cb",
    "signature": "0x599456e4cabf46514b9473b80045cc10297880c4a6e1e8f7efca2bd8caef1d61265c8a7bb4bb526b1291f3d51cc17de2e90c95c45a7a44245ed348fe9f7be0871c",
    "signer": "0x408CbFDbc09C9aFB99Da5f010D04f50A190b83B6",
    "userId": "675830993"
  }
}