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core: split same-td blocks on block height #15470

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Nov 15, 2017
Merged

core: split same-td blocks on block height #15470

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7 changes: 6 additions & 1 deletion core/blockchain.go
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Original file line number Diff line number Diff line change
Expand Up @@ -818,7 +818,12 @@ func (bc *BlockChain) WriteBlockAndState(block *types.Block, receipts []*types.R
// 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
if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
reorg := externTd.Cmp(localTd) > 0
if !reorg && externTd.Cmp(localTd) == 0 {
// Split same-difficulty blocks by number, then at random
reorg = block.NumberU64() < bc.currentBlock.NumberU64() || (block.NumberU64() == bc.currentBlock.NumberU64() && mrand.Float64() < 0.5)
}
if reorg {
// Reorganise the chain if the parent is not the head block
if block.ParentHash() != bc.currentBlock.Hash() {
if err := bc.reorg(bc.currentBlock, block); err != nil {
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