{
  "manageEntity": {
    "action": "Save",
    "entityId": "675817697",
    "entityType": "Track",
    "nonce": "0x8e92c2fb3b554d836d9572b9d0be654e388dc3acd8c4e6e1b2b1b3d84fe1e761",
    "signature": "0xfa8907a08e5631d060058f7e12979907f92fa2732c393d17c27666fc020c92b64332e2489bf6ec8ed7f9d618e1893fa01a8b6242acd822c789b9f67629df15fe1b",
    "signer": "0x9FF2A7F5Fab732dA57359bb3eD63a95511bD1329",
    "userId": "67863854"
  }
}