For the last approximately 24 hours, Ropsten testnet is under an attack in my opinion. The gas limit is raised to 200m
and the attacker was proposing blocks with more than 4,000
internal txs transfering 1 wei
to different addresses. Mining reward is more than 12 eth
now.
I think this is the block started the attack https://testnet.etherscan.io/block/586948.
I believe this makes my computer sync extremely slow and for the past 24 hours, I haven't been able to catch up with the chain.
However, looks like the attacker stopped attacking but other miners are still follow the gas limit. Maybe people don't know how to lower gas limit even that miners can do so at some point, some percent of current gas limit.
So my question is: What is the easiest way for miners to lower gas limit? Does it actually help?
Edit 1:
There is a hero with this address 0x00d92369a644ab070f38f8877b50feb5b61508ed is trying to lower the gas limit by proposing many (almost 2000 blocks now) empty blocks with lowered gas limit set. His first block is here https://testnet.etherscan.io/block/590360.
Edit 2:
The testnet is forked now. It split at block number 590359. Looks like the joke hasn't ended yet.
Best Answer
Update - 25th March 2017
Ropsten has been revived!
https://github.com/ethereum/ropsten/blob/master/revival.md
Update - 18th March 2017
From the https://testnet.etherscan.io/ homepage:
Update - 6th March 2017
Ropsten should be considered dead. See the answer from 5chdn - (and upvote it!) - for details on its replacement.
For users running Parity, there was a workaround published on the Parity Gitter channel:
Edit:
The below instructions for Geth don't actually work, presumably due to the Parity and Geth chainspecs (
genesis.json
formats) being incompatible, though Geth won't tell you this when you pass it togeth init
.And the equivalent for Geth using the sameropsten-revert.json
file:~/.ethereum/testnet/chaindata
folder.json
file:geth --testnet init <path/to/ropsten-revert.json>
Start Geth with whatever options you normally use, e.g.:geth --testnet --fast --rpc --rpcapi db,eth,net,web3,personal --cache=1024 --rpcport 8545 --rpcaddr 127.0.0.1 --rpccorsdomain "*"