You're on the right track. The witnesses sign the blocks that contain the transactions and cause the chain to grow. Every time a witness signs a block they get a reward paid in vests (steem power) much like bitcoin miners get a reward for solving a block.
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got it! thanks!
Hey! Would you mind explaining what VESTS are? I have seen the symbol several times, and I understand they are related to Steem Power, but I don't really get how, are they the same? What is their purpose?
Thank for the info!