Multiple consensus algorithms for different blockchains can exist depending on how the nodes reach a consensus. For example, Bitcoin uses proof-of-work. Some other examples include: Proof-of-Capacity (PoC)  Proof-of-Activity (PoA)  Delegated Proof-of-Stake(DPoS)  Proof-of-Stake(PoS)  Proof-of-Authority  Proof-of-Trust  Proof-of-Burn   Unique Node Lists   Proof-of-Weight   Proof-of-History  Proof-of-Elapsed Time  SIEVE  Byzantine Fault Tolerance