{
  "manageEntity": {
    "action": "Save",
    "entityId": "1743892398",
    "entityType": "Track",
    "nonce": "0x8a40d8462e233f28e00f46c6c5e5fd107e2026a8382430434ca8435bb89e524c",
    "signature": "0xdb007653b893076a86d4eba8e126117f877880098edaf558b127ae1edc5992726a274c0079a106fe2e2090c33f997bf3881f3737f32ce20b3a9d28148eb4987c1c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}