{
  "manageEntity": {
    "action": "Save",
    "entityId": "377539399",
    "entityType": "Track",
    "nonce": "0x39663f03f4b57eb3dfccd5231b89ac47b8c131a8d05e9efd8009f94fc8577194",
    "signature": "0x98ede7e996211c953d6c0b7f2e27c33bdc998630f2a747842f4dfdfdf431fb1260de053e4980ad4826a58e984f35c8487a37657f2aec8d0624acfe977c742ac01b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}