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For information, you can play proxies in some competitive MTG games if you prove you have the card. And in less known games like vampire CCG, proxies are allowed in tournaments without proving anything (and imho it makes that game even more competitive, and allow players to modify their deck at will depending on the clans/player at the table.

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> prove you have the card

this is where blockchain is well suited. user can sign a message with their private key and cryptographically prove ownership where all other parties can also verify it cryptographically

> proxies are allowed in tournaments without proving anything

cool! but not what most refer to when talking about trading card games. if you have access to all cards in the game at any point there is no need to trade or do anything in particular to acquire and own a specific card except to say “I choose that.” if a game works like that it wouldn’t make sense to build blockchain based ownership around it.

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