Proof of Burn https://coinscapture.com/blog/proof-of-burn-explained
To prevent double spending issues of various cryptocurrencies and safeguard blockchain's decentralization feature, it is important to ensure that all nodes in the network share common agreement about the present state of the blockchain. This agreement is achieved by various consensus algorithms like Proof of work (PoW), Proof of Stake (PoS), Proof of Burn (PoB) and Proof of Authority (PoA), etc. Proof of work (PoW) is a consensus algorithm that involves solving a complex cryptographic puzzle. The first user to solve the puzzle gets the mining right. But this process consumes a large amount of electricity and time along with costly mining hardware