{
  "manageEntity": {
    "action": "Save",
    "entityId": "803340076",
    "entityType": "Track",
    "nonce": "0x50cb3abcc87e159464bad78d6c7754418d261f673646b3d9c805b2d58385c6fe",
    "signature": "0x07408ae9f7bab4a71e7bfa5bf001a5e2f5160302cde6707b7bb0b950237640971168e2032b61496f80230886a86569bac107dc73fe1bf6e594996b8efb8ed8131c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}