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> What if adding a cooldown of 30 seconds on giving merits to avoid this glitch and also to avoid merit abuse. <
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It was fixed, back on the 29th of December 2018:
Alright, you now can't merit the same post with the same amount within 60 seconds.
The double spend being discussed would have happened anyway, since despite it being prior to the fix (22/12/2018), the two TXs were 2 minute and 34 seconds apart. I get similar bugs when Im retrieving information to update my DB, whilst at the same time trying to merit a post. In my case its due to firecloud getting too many petitions from the same IP, but also public wifis tend to disconnect or have micro-interruptions. Regardless, this is not the issue.
Really, there I not much of an issue at all. It doesnt matter whether it was 5 or 10 merits. Currently, 7.976 5 sMerit TXs have been handed out (2.824 10 sMerit TXs). People are entitled to go through the merit TXs, and that is why they are made public. Nevertheless, awarding criteria is fortunately diverse, and that is the whole point of it. Not all will agree neither with the fact of meriting a given post, nor with the quantity, but that is down to diversity of criteria here, not to abuse.