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I dont understand why the blockchain suffers from basic validation errors.

There need to be more reviews on steem blockchain code... I wonder theres more such basic validation error.. What if theres more different transaction that didnt check for basic negative value. Will our chain freeze again?

Getting hacked is a terrible look for a website involved with money, it's better it happens earlier in the website's life

it happens earlier in the website's life

Steem is more than 2 years old.

That's not particularly old, though I agree that validation errors like this should have been tested for and caught before this. That being said: everyone makes mistakes.