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ahhh i see. thanks, I didnt know.

 7 years ago  Reveal Comment

A STEEM witness is a person whom operates a witness server (which produces blocks), and publishes a price feed of STEEM/USD to the network.

Witnesses have many tasks. The first and foremost is to produce blocks (thus process transactions), the second most important is to produce a price feed, which is how STEEM Dollars are always worth 1 US Dollar in STEEM (using the 7 day exchange).
@baah