بالنظر إلى حجم استعماله، أخشى أنه يستخدم غالبا من أجل التمويل غير المشروع. إنها طريقة غير فعالة بتاتا لإجراء المعاملات المالية، وكمية الطاقة المستهلكة في معالجة تلك المعاملات مذهلة.

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