As Geth and Parity forking version are out, the switch to a soft fork related to The DAO is said to happend on block 1800000 if block gas limit is below or equal to 4M. We can see global gas limit on sites like https://ethstats.net/ but they don't represent the whole Ethereum system.

But how to check a particular pool (Ethermine on which I mine is 0xEA674fdDe714fd979de3EdF0F56AA9716B898ec8) gas limit to see if it runs the client in this particular fork mode ?

1 Answer 1


The block gasLimit is in each block. Example:


  difficulty: 34982465665323,
  extraData: "0xd783010305844765746887676f312e352e31856c696e7578",
  gasLimit: 4712388,
  miner: ...

If the gasLimit of the next block decreases, it suggests that the client is running the fork mode to try to bring the gasLimit below 4M.

The extraData and miner in the block can provide clues on which mining pool it is. (Note that miners don't have to set extraData and can change their miner address.)

  • So I could look at the gas limit in etherscan.io/… and if it decreases it means that the pool runs for the fork ? Jun 24, 2016 at 22:38
  • Ethermine and DwarfPool both show a 4,712,388 Wei gas limit, same since at least a week, so I guess the fork didn't start for these pools. Jun 24, 2016 at 22:47
  • 1
    Yes, keep an eye out on the blocks they mine to see if gasLimit decreases.
    – eth
    Jun 25, 2016 at 10:40
  • Etherscan put a nice graph to check the gas limit and Ethermine gas limit started to decrease so the fork vote is starting. Jun 26, 2016 at 9:20

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