I think that's impossible to create. If it would be, people would use it for key generators and that kind of crap.
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i agree with you but i think a tool like that it would be very usefull for verify if one free key its for a crappy game or a good one :)
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The only way to verify a key is to activate it on an account, rendering it useless for anyone else.
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I got so many keys from trades that turn out to be invalid or dup but couldn't check them without adding it to my library
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You know afterwards so either tell them and have them reimburse you or report them and do not trade with them again. It is quite easy to avoid dead keys in trades, or at least get something else worthwhile instead
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I think it was determined that the product already owned message takes precedent over the duplicate code one, likely for this very reason. You can usually use thise to determine what a key is but not its validity.
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What are priorities of these messages? If the key is invalid it would say straight away, apparently. I'm not sure about duplicates though - If it shows "you already own the game" before "duplicate code" or the other way round.
edit: nevermind, question already answered.
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there should be a key verifer so you know the key you got in a trade is not a dup or invalid and it's not tied into your steam account
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