Glossary > Proof-of-stake (PoS)
The proof-of-stake consensus is one way to validate transactions and to add them to the blockchain. With a proof-of-stake consensus, a person will be able to mine a certain amount of blocks according to the coins he/she owns. More simply put, the more coins the person holds, the more blocks he/she can mine.
This kind of consensus is an alternative to the proof-of-work consensus, used in the Bitcoin blockchain for example. It solves the problem of energy consumption inherent to the proof-of-work consensus. The PoS consensus also prevents 51% attacks. Indeed, it is not advantageous for a miner holding 51% of the coins to attack the network.