[lbry] blockchain, wire: verify blockheaders using LBRY PoW
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2 changed files with 13 additions and 1 deletions
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@ -324,7 +324,7 @@ func checkProofOfWork(header *wire.BlockHeader, powLimit *big.Int, flags Behavio
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// to avoid proof of work checks is set.
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if flags&BFNoPoWCheck != BFNoPoWCheck {
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// The block hash must be less than the claimed target.
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hash := header.BlockHash()
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hash := header.BlockPoWHash()
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hashNum := HashToBig(&hash)
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if hashNum.Cmp(target) > 0 {
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str := fmt.Sprintf("block hash of %064x is higher than "+
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@ -59,6 +59,18 @@ func (h *BlockHeader) BlockHash() chainhash.Hash {
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return chainhash.DoubleHashH(buf.Bytes())
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}
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// BlockPoWHash computes the block identifier hash for the given block header.
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func (h *BlockHeader) BlockPoWHash() chainhash.Hash {
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// Encode the header and double sha256 everything prior to the number of
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// transactions. Ignore the error returns since there is no way the
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// encode could fail except being out of memory which would cause a
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// run-time panic.
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buf := bytes.NewBuffer(make([]byte, 0, MaxBlockHeaderPayload))
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_ = writeBlockHeader(buf, 0, h)
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return chainhash.LbryPoWHashH(buf.Bytes())
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}
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// BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
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// This is part of the Message interface implementation.
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// See Deserialize for decoding block headers stored to disk, such as in a
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