{
  "manageEntity": {
    "action": "Save",
    "entityId": "504942322",
    "entityType": "Track",
    "nonce": "0xd1611bb4f4774cf67fc384c14ce472ac9b1b612515290022ebab8b5ff42e7580",
    "signature": "0xa80ad2a966b6a07a2d8e122c692efd567c07d45ce7d7d83140aae3d0b57aa978657da3d762640a326cb53f60e78808a92a134ff24fd46c5af7c1b507ac4fbdad1b",
    "signer": "0xFbfE539e9A45D0A6bdcc4b126a35a49cB2Cf8DA6",
    "userId": "488993730"
  }
}