{
  "manageEntity": {
    "action": "Save",
    "entityId": "379991482",
    "entityType": "Track",
    "nonce": "0x8890bda8c71c106e3f5734940a9f2a7fcd17729af948fbe99b9738a29fa96da3",
    "signature": "0xd08a654c0b4bc157d32834ff11ac8845baca79e037810f247b6ea8bb295d283f2c3b68d8a06b9355adab8009285579beec0264cd90ee7a2c62cbfb629638fe0e1c",
    "signer": "0x1080460F21DCc82D7160d2C77DaAb22a92c4dD22",
    "userId": "162106877"
  }
}