I think Libra is special in terms of its ambition to be used by billions of people and that they took other measures (e.g. the Libra reserve to lower volatility) to make it a wide-spread payment method. Other cryptocurrencies seem to be focussed on other goals, at least in practice.

There are some more technical details in the extended blog post – https://www.benthamsgaze.org/2016/08/02/do-you-know-what-you...

My comments on some of the key findings of the report are here: https://www.benthamsgaze.org/2016/07/13/cybersecurity-suppor...

The open-access version of the full paper has been made available by the Internet Society: https://www.internetsociety.org/sites/default/files/blogs-me...

An update on this story shows that GCHQ also tried to squash another key exchange algorithm (MIKEY-IBAKE) because it made surveillance too hard – and this was the motivation for MIKEY-SAKE http://www.theregister.co.uk/2016/01/21/mikey_ibake/

Bruce Schneier also has some stories of different but related credit card scams which also exploit the fact that authorisation codes are not checked at the time of the transaction: https://www.schneier.com/blog/archives/2014/07/debit_card_ov... and https://www.schneier.com/blog/archives/2009/01/in-person_cre...