Here, any user with access to the internet is restricted from being involved in the process of transaction verification. (bitmainnews.com)
It is an example of the need to implement transaction verification in the industry - standard way rather than with implementation shortcuts that rely on known - unsafe methodologies. (blog.blockchain.com)
This is particularly likely when trying to use self - service payment machines, such as ticket kiosks, which use an offline transaction verification processes that US credit cards are not typically configured to use. (cardrates.com)