Mining of cryptocurrencies, such as Bitcoin, is based on wasting of a huge amount of computing power and electricity, which deteriorate the environment. They call it ‘Proof-of-Work’. We can call it ‘proof-of-stupid-work’.

Yet, mining is necessary for the existence of cryptocurrencies. Other variants:

• Proof-of-Stake
• Proof-of-Importance
• Proof-of-Space or Proof-of-Capacity
• Proof-of-Authority
• Proof-of-Burn

Now eDucat Team are working on a Proof-of-Learning Protocol.