{
  "manageEntity": {
    "action": "Save",
    "entityId": "481065071",
    "entityType": "Track",
    "nonce": "0xf720a9bee81d6cfd8569e6bb7ae6f42aa6d0b306a3d5f12a0887c7a98d8ba162",
    "signature": "0xfbeb22421865cfece6bb290e091d30bf4ec37324ea88187cc77f474aadcaeb37710b5b5946732d41040bf1db8e0700d6cd0566a0f3f23d0b94350a7d86e7b43a1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}