{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "620307004",
    "entityType": "User",
    "nonce": "0x030e4acfffc54717ee6b7b599a6542439a3cc507b7b2b9501de9f8bcc7012d8d",
    "signature": "0x64a3dc2f59c708f86c03179523afe11faa10c51771ec803ff079bf0dc78fec5179350c8caa28af6b6f5121b7237d3d111b891a3d6b13907e95f1de0a4286702c1c",
    "signer": "0x53f39D73a2dd51E9e8A362EF3b1383072E37cf26",
    "userId": "74209883"
  }
}