{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "781543844",
    "entityType": "User",
    "nonce": "0x8516b9f15c431e94791768b0bdfa45e702b5de5fe10eee7cb31844dbf7658639",
    "signature": "0x2afdeb74c1ba245ed5dace6eda01d7d0b73d9ab0c830b4fc6251dd28261302461b820a5a2fc66a872d57e2ef42f8f1e34a93ba0d39f1b726fc1e9b71fcfeee331c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}