Members of the Ethereum Classic team reported that the network suffered a reorganization (reorg) today.The blockchain network is asking service providers to halt deposits while it carries out maintenance of the chain.
The latest event follows a similar attack in January 2019, which led to some exchanges taking pre-emptive action.
Both Ethereum Classic (ETC) and one of the founders have since put out a statement acknowledging this event which they term a chain split. ETC suffered a reorganization (reorg) of approximately 3,693 ETC blocks which occurred at block 10,904,146.
According to a report
by Ethereum Classic team members, “there was about 3000 block-insertion
by a miner who was mining (either offline or there total difficulty
could have exceeded current network difficulty while they were honestly
mining) for about 12 hours on Core-Geth.”
In a short prognosis of
the chain split, Ethereum Classic developers say it has identified the
offending miner. The network maintainers added they doubt any major
double-spend attacks occurred. Even though the miner was identified, it
is uncertain whether or not it was a malicious 51% attack that caused
the reorg. Developer James Wo claims it was “not a 51% attack” and
stressed “a miner went offline and was using old client software.”
In the diagnosis, Ethereum Classic developers said:
It
could be that the offending miner has lost access to internet access
for a while when mining, which led to a 12 hour mining period and about
3,000 blocks inserted. On the first 2,000 blocks, there was 1 miner and a
total of 5 transactions. It also seems that the offending miner has
uncled their own blocks by how fast they were mining.
The
offending miner used the address
0x75d1e5477f1fdaad6e0e3d433ab69b08c482f14e. Ethereum Classic team
members also provided a timeline of the events.
Commenting
on the possible impact of the chain split, Ethereum Classic members say
“any transactions during that time are possibly not mined in the order
they were intended to have been mined in.”
The ETC
devs add, “the about 3,000 blocks had a mean of 0 transactions mined,
and any transactions that aren’t mined will be re-submitted to the
mempool during a re-org.”
Ethereum Classic team members are
advising miners to “continue mining the chain as-is (chain is currently
following the heaviest work which includes the about 3,000 blocks
inserted). This is the recommended option as the chain is following
proof-of-work (PoW) with the longest chain as intended.”
In 2019, Coinbase detected
a deep chain reorganization of the Ethereum Classic blockchain, which
included a double spend. The exchange immediately ceased interactions
with the blockchain.
This time around, the Ethereum Classic team
members have taken the pre-emptive step of advising exchanges to halt
deposits and withdrawals until investigations are complete.
A 51% attack
is a potential attack on a blockchain network, where a single entity or
organization is able to control the majority of the hash rate,
potentially causing network disruption.
In such a scenario, the attacker would have enough mining power to intentionally exclude or modify the ordering of transactions.
What do you think of the latest attack on Ethereum Classic? Share your thoughts in the comments section.
source link : https://news.bitcoin.com/single-miner-reorgs-ethereum-classic-devs-report-a-chain-split/
