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All Hive wallets, excluding the Hive DAO wallet (fingers are a requirement for claiming!) - So yes, exchanges can claim on behalf of their users. But I would not trust an exchange to claim! Please, if possible, get your HIVE into YOUR account that you have control of the keys!

Should not allow exchanges to claim, that's a lot of dumping the can do and your team will potentially be blamed for giving exchanges huge amounts of supply they can and will dump driving prices down.

This is a huge oversight that should not be ignored that can ruin your projects reputation