Delegated Proof of Stake (DPOS)

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Delegated Proof of Stake (DPOS) is a consensus model used in Steem, Bitshares and EOS.

In Steem, people with vested interest select trusted individuals (witnesses) responsible for including testimonies (blocks with transactions) to the public ledger.

There are 21 witnesses in Steem (the 20 most voted for plus one randomly selected from the rest).

Sources

Steem White Paper