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core/forkid: correctly compute forkid when timestamp fork is activated in genesis #27895

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Merged
merged 1 commit into from
Aug 16, 2023
Merged

core/forkid: correctly compute forkid when timestamp fork is activated in genesis #27895

merged 1 commit into from
Aug 16, 2023

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There is an issue with how we compute forkid values for networks where a time-based fork is activated in genesis. Currently, we have no in forkid.NewID to determine the genesis' timestamp and per EIP-6122:

If a chain is configured to start with a non-Frontier ruleset already in its genesis, that is NOT considered a fork.

However, since the NewID function cannot know the timestamp of the genesis block, it is unable to differentiate the case where a time-base fork activation is equal to the time of genesis and correctly skip the block.

Here is an example genesis.json:

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  },
  "coinbase": "0x0000000000000000000000000000000000000000",
  "baseFeePerGas": "0x3B9ACA00",
  "difficulty": "0x01",
  "extraData": "",
  "gasLimit": "0x17D7840",
  "nonce": "0x1234",
  "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp": "1690475657",
  "config": {
    "chainId": 1337,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "berlinBlock": 0,
    "londonBlock": 0,
    "preMergeForkBlock": 0,
    "shanghaiTime": 1690475657,
    "terminalTotalDifficulty": 0,
    "ethash": {},
    "cancunTime": 1690476041
  }
}

Before this change, it would output a forkid of 0xa614adaf 1690476041. Now it outputs 0x06278388 1690476041. The forkid calculation to get these values is:

0x06278388 = crc32(0xb5d071ce89eadb53073b2839cdacedcd200a0dd1f641709156eba02b2c48d889)
0xa614adaf = crc32(0xb5d071ce89eadb53073b2839cdacedcd200a0dd1f641709156eba02b2c48d889 || 1690475657)

Therefore this PR correctly skips applying time-based forks to the forkid hash when the fork is already active in genesis.

@lightclient lightclient force-pushed the fix-forkid-time-genesis branch 2 times, most recently from 74ee5b4 to 33560cb Compare August 10, 2023 15:10
@qu0b qu0b mentioned this pull request Aug 11, 2023
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@lightclient lightclient force-pushed the fix-forkid-time-genesis branch from 33560cb to 1f7bf7e Compare August 11, 2023 11:33
@lightclient lightclient mentioned this pull request Aug 14, 2023
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@jochem-brouwer jochem-brouwer mentioned this pull request Aug 14, 2023
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MariusVanDerWijden
MariusVanDerWijden approved these changes Aug 15, 2023
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LGTM

@fjl fjl merged commit 32fde3f into ethereum:master Aug 16, 2023
@fjl fjl changed the title all: correctly compute forkid when timestamp fork is activated in genesis core/forkid: correctly compute forkid when timestamp fork is activated in genesis Aug 16, 2023
@fjl fjl added this to the 1.13.0 milestone Aug 16, 2023
@yperbasis yperbasis mentioned this pull request Aug 21, 2023
Merged
yperbasis added a commit to erigontech/erigon that referenced this pull request Aug 21, 2023
@yperbasis
Correctly compute fork id when timestamp fork is activated in genesis (…
6bc0ca9 
…#8046)

See ethereum/go-ethereum#27895
@lightclient lightclient mentioned this pull request Aug 31, 2023
Merged
AskAlexSharov pushed a commit to erigontech/erigon that referenced this pull request Sep 6, 2023
@yperbasis @AskAlexSharov
Correctly compute fork id when timestamp fork is activated in genesis (…
c57850b 
…#8046)

See ethereum/go-ethereum#27895
@Rjected Rjected mentioned this pull request Sep 6, 2023
Merged
devopsbo3 pushed a commit to HorizenOfficial/go-ethereum that referenced this pull request Nov 10, 2023
@lightclient @devopsbo3
core/forkid: correctly compute forkid when timestamp fork is activate…
db56844 
…d in genesis (ethereum#27895)

This changes the forkID calculation to ignore time-based forks that occurred before the
genesis block. It's supposed to be done this way because the spec says:

> If a chain is configured to start with a non-Frontier ruleset already in its genesis, that is NOT considered a fork.
devopsbo3 added a commit to HorizenOfficial/go-ethereum that referenced this pull request Nov 10, 2023
@devopsbo3
Revert "core/forkid: correctly compute forkid when timestamp fork is …
16c1ad7 
…activated in genesis (ethereum#27895)"

This reverts commit db56844.
devopsbo3 added a commit to HorizenOfficial/go-ethereum that referenced this pull request Nov 10, 2023
@devopsbo3
Revert "core/forkid: correctly compute forkid when timestamp fork is …
c673dcc 
…activated in genesis (ethereum#27895)"

This reverts commit db56844.
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@MariusVanDerWijden MariusVanDerWijden MariusVanDerWijden approved these changes

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@rjl493456442 rjl493456442 Awaiting requested review from rjl493456442 rjl493456442 is a code owner

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