{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "900751573",
    "entityType": "User",
    "nonce": "0x13819d92b90a9571feb26e876f4a01d02c05d52903ae3386419e8bb262980f6a",
    "signature": "0x65ebc2f1c7ea2b085fc4aa107b7b3e5e1f1c937649f4e0a50b9b108c1d7dac16364f941f2e71ab023e595fa0a3e071c80dfd9f1748f9b01abdd89dc98474888c1c",
    "signer": "0x408CbFDbc09C9aFB99Da5f010D04f50A190b83B6",
    "userId": "675830993"
  }
}