{
  "manageEntity": {
    "action": "Save",
    "entityId": "471113",
    "entityType": "Track",
    "nonce": "0xff69028b550d65bff5fa1e38d71453f7f51e76f9b07495cc7e7544d3d8f21ffd",
    "signature": "0x5f3314ddee01ed4ff758c31f1da8ab04c3f26ec6f79f1ca5b7beda401444cb002d02b1ebd674e666b7c0f0fe85d8e93c3def136432ec7ed5ef1b4750ac1ce70c1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}