{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "721084704",
    "entityType": "User",
    "nonce": "0x6711fb442b2a09960e657c19d1d0b723e0829f7af20ce3678b939703dd25f4df",
    "signature": "0x3f2422db4e80c766ddc1d962dd9efbcf7c70071303c4fc857f528279c4c744f70c8e403508b31e6ecfa14060a8366a02937c1084f20f75c70e8293e36d1591071c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}