core: check for parent in calc TD. TD = (N != 0 == parent.TD) || (== D)
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@ -49,6 +49,10 @@ func CalcDifficulty(block, parent *types.Header) *big.Int {
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}
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func CalculateTD(block, parent *types.Block) *big.Int {
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if parent == nil {
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return block.Difficulty()
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}
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td := new(big.Int).Add(parent.Td, block.Header().Difficulty)
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return td
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