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Usage of longest-chain instead of most-work #1186

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gregdhill opened this issue Sep 1, 2023 · 2 comments · May be fixed by #1198
Open

Usage of longest-chain instead of most-work #1186

gregdhill opened this issue Sep 1, 2023 · 2 comments · May be fixed by #1198
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@nakul1010
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bug Something isn't working prio:high

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@gregdhill
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Describe the bug
The BTCRelay incorrectly sets the main chain as the longest fork instead of that which has the most work. This means that an attacker with significant mining power could mine a chain with an invalid timestamp to lower the difficulty after each readjustment period. It is currently not economically feasible to exploit due to the required mining requirements.

Expected behavior
We should only reorg when the fork has more work than the current main chain, see how electrum does that here.

Additional context
The summa relay here only checks the chain work when reorging but it does not support reorgs over 2017 blocks.
@gregdhill gregdhill added bug Something isn't working prio:high labels Sep 1, 2023
@nakul1010
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nakul1010 commented Sep 6, 2023 •
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@gregdhill Thanks for the references few questions

  • I am expected to extend this if condition
    • &&( get_chainwork(current_fork.max_height) >= get_chainwork(prev_chain.max_height))
  • Regarding the target var in electrum is same as in bitcoin types here right ?

@gregdhill
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Yes we need to extend that condition and we should also update ensure_no_ongoing_fork. I can't see which target type you are linking to in electrum, but I am assuming it is the same.

@nakul1010 nakul1010 linked a pull request Sep 20, 2023 that will close this issue
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@gregdhill gregdhill mentioned this issue Oct 10, 2023
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@gregdhill gregdhill mentioned this issue Jul 9, 2024
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fix: Fix BTCRelay Chain Reorganization to Prioritize Work Over Length interlay/interbtc
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@gregdhill @nakul1010