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<p>[QUOTE="Jaelus, post: 3112658, member: 46237"]They were trying to protect their site from data miners. You could previously spam their site with requests going sequentially through cert numbers. If a number didn't exist it would give you an error, and if you found a valid cert number with -001 you could just increment and pull all the coins until you found the upper boundary. Rinse and repeat for the next number. Eventually you'd have their whole catalog (and you could automatically download the high resolution images as well). This was a big burden on the servers and a threat to their copyright on the images.</p><p><br /></p><p>As a mitigation they now require you to know the grade, so you can't just request a random coin without having knowledge of it. Now you could try to guess the grade and that would have been an even bigger strain on the servers as a data miner loops through every possible grade for the -001 coin on a given submission number, but they cap you at 10 requests within a short time span to prevent that. These two changes together are what effectively block data mining.[/QUOTE]</p><p><br /></p>
[QUOTE="Jaelus, post: 3112658, member: 46237"]They were trying to protect their site from data miners. You could previously spam their site with requests going sequentially through cert numbers. If a number didn't exist it would give you an error, and if you found a valid cert number with -001 you could just increment and pull all the coins until you found the upper boundary. Rinse and repeat for the next number. Eventually you'd have their whole catalog (and you could automatically download the high resolution images as well). This was a big burden on the servers and a threat to their copyright on the images. As a mitigation they now require you to know the grade, so you can't just request a random coin without having knowledge of it. Now you could try to guess the grade and that would have been an even bigger strain on the servers as a data miner loops through every possible grade for the -001 coin on a given submission number, but they cap you at 10 requests within a short time span to prevent that. These two changes together are what effectively block data mining.[/QUOTE]
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