LMD_GHOST

Ah, I see! LMD_GHOST is a consensus algorithm used by the Ethereum network. It stands for "Loopring Maximum Decentralization - Greedy Heaviest Observed Sub-Tree".

LMD_GHOST is an extension of the GHOST (Greedy Heaviest Observed Sub-Tree) algorithm used in Bitcoin, designed to help Ethereum handle a higher transaction throughput. LMD_GHOST takes into account the weight of each block in the blockchain, rather than just the longest chain, to help prevent forks and improve the overall security and efficiency of the network.

In Ethereum, LMD_GHOST is used in conjunction with the proof-of-work consensus algorithm to validate and add new blocks to the blockchain. It is also used in some of the proposed proof-of-stake implementations for Ethereum 2.0.