{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "900325196",
    "entityType": "User",
    "nonce": "0x3f856acce861ff89d2a10e5680b080eb4659a739a99cd5c0e67da0888e6683db",
    "signature": "0x67335e44b26d82068882366da9fd3b22b986b44b5f85f6ba95f6b170420757a038dbcf11842df3b744fe4c69e48b1e61c8628c3b2e9b525f67f8afe04536df241b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}