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Reject single-block reorgs to prevent uncle maker attack #1

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Reject single-block reorgs to prevent uncle maker attack #1

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7 changes: 7 additions & 0 deletions core/forkchoice.go
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,13 @@ func (f *ForkChoice) ReorgNeeded(current *types.Header, header *types.Header) (b
if ttd := f.chain.Config().TerminalTotalDifficulty; ttd != nil && ttd.Cmp(externTd) <= 0 {
return true, nil
}

if current.Number.Cmp(header.Number) == 0 {
// Reject single-block reorgs to mitigate uncle maker attack.
// Refer to https://eprint.iacr.org/2022/1020 for more info.
return false, nil
}

// If the total difficulty is higher than our known, add it to the canonical chain
// Second clause in the if statement reduces the vulnerability to selfish mining.
// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
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