{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "515307498",
    "entityType": "User",
    "nonce": "0xa66e6af383c035cf2a38a9472c18b9ab1d51a8e5e85b4d91de53ba1b0578bd6a",
    "signature": "0x0104a4bf5ecbdd4f374cbf9d7afbc04040dbb08b649c197c47059a0b3dd7ac7a0148e5900bb43e9bb6d4fb5ce44c82cc228baa3ae8977c7aa50bf2e1b10ac9b01c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}