Islamist terrorism continues to claim numerous victims worldwide. Extremist networks are financed in part by donations from Germany. But investigations often prove to be difficult. Money from Germany repeatedly finds its way into structures that support Islamist terror. This occurs via bank transfers, donation associations, online payment services, and even cryptocurrencies. Many small amounts can add up to large sums. Such cash flows often go unnoticed because investigations in Germany – unlike in some other countries – often fail due to legal hurdles.