{
  "manageEntity": {
    "action": "Save",
    "entityId": "773832733",
    "entityType": "Track",
    "nonce": "0x40535887cbd85b9008cb80f5d0231977e2e34b50f6f47f3f25591978ff108b0b",
    "signature": "0x1f1ed052214c9bdabf3f8d331f5c50be9f359853b6198b1609ba343a639b7e7a581b175d35564b152ebf71f1120360ab08d7dce7359c48fcead5f9d656b8db9b1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}