{
  "manageEntity": {
    "action": "Save",
    "entityId": "454283",
    "entityType": "Track",
    "nonce": "0x1459129d4fd6301335ae4c7f61b9ee39ad9f6a705a09e8b710ef9fc48274c28a",
    "signature": "0xfdf15bccd338107cdc6da0caa8c958bb6b756fe728470e3d515e6e419ba19470282b9b3dda65bb3cc06eec47eb0832f18ecf8423b39784062c0c8d412f3b5e0c1c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}