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I am talking about the mining pool, which effectively stakes on your behalf if you mine with it.

I'm a member of grcpool but they don't have any access to my stash of GRC. With the Waves platform they limit staking to larger holders of Waves (I think it's about 10,000) but smaller holders like me can lease theirs to another person who can stake the aggregate. Other platforms allow lending or an equivalent (STEEM is one of them).