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RE: Vlog #19: Steempower is protecting many Steemians from emotional selling and hacks.
To keep it simple. To identify you as you on the steem blockchain there are 2 keys. Public keys and Private keys. The public key under your account is visible for everyone....but there is only one private key that can 'communicate' with this public key. That's you. that's why when you post something I know it comes from you.