What are the disadvantages of proof-of-stake blockchain technology?

On PoW based blockchains like Bitcoin, the next block of a transaction can only be added to the blockchain if the validator (or miner) finds a valid solution for a cryptographic puzzle. Its disadvantage lies in the fact that a lot of costly equipment is needed for mining and finding the right solution.

Disadvantages of the Proof-of-Stake Framework:

  • The Monopoly Problem
  • The Bribe Attack