Ethereum Classic (ETC) developers announced a hard fork named Thanos. It will take place on November 29 at block #11 700 000 and is designed to enhance network security after a series of recent 51% attacks.
#ICYMI, see how #EthereumClassic is preparing for the Thanos hard fork upgrade via @etc_core written by our Developer Relations Manager, @McDappas! https://t.co/X1xKngKsHB
— Ethereum Classic Labs (@etclabs) November 21, 2020
The Thanos update ECIP-1099 will double the Ethash (Etchash) epoch length from 30,000 to 60,000 blocks, effectively reducing the size of the directed acyclic graph [DAG]. This will allow GPUs with 3 GB and 4 GB to resume mining Ethereum Classic.
“Thanos will reduce the size of the DAG, which will lead to a more distributed and healthier mining ecosystem. The hash rate will increase. This will allow existing miners to continue mining and attract new ones,” said James Wo, founder and CEO of Ethereum Classic Labs.
It is also noted that the update will not adversely affect compatibility with Ethereum (ETH).
In October, the Ethereum Classic Core and Ethereum Classic Labs teams implemented in the Mordor testnet the Exponential Subjective Scoring (MESS) solution. The new finality algorithm increased the cost of reorganizations by nearly 31-fold, thereby eliminating, it is claimed, the motive for 51% attacks.
In its recent report, representatives of IOHK, the Cardano developer and participant in the ETC Cooperative initiative, выразили doubt that MESS would completely eliminate the possibility of new reorganizations in the Ethereum Classic blockchain.
Japanese exchanges stopped accepting Ethereum Classic due to the increasing number of 51% attacks
In August, the Ethereum Classic network was subjected to 51% attacks on three occasions. The depth of the latest reorganization reached 7,000 blocks, which is roughly equivalent to about two days of mining.
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