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Pure Proof-of-Stake: Algorand uses a Pure Proof-of-Stake (PPoS) consensus protocol built on Byzantine agreement whereby the users' influence on the choice of a new block is proportional to their stake in the system.
Immediate transaction finality: Algorand blockchain does not fork as only one block can have the required threshold of signatures in order to be certified in a given round.
Self-selection: all users are randomly, secretly, and continuously selected to participate in the Algorand consensus protocol - neither a few delegated users nor a fixed committee is responsible for proposing blocks in Algorand.
User replaceability: participants change every round of block selection in order to protect the network against attackers - for each round, every set of participants is random and independent of earlier participants.