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Merge #18379: doc: Comment fix merkle.cpp

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5b59a19731 Update merkle.cpp (4d55397500)

Pull request description:

  Change comment from `The reason is that if the number of hashes in the list at a given time
  is odd`, to ` The reason is that if the number of hashes in the list at a given level
         is odd` (to be a bit more precise: replacing `time` with `level`)

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ACKs for top commit:
  MarcoFalke:
    ACK 5b59a19731
  instagibbs:
    ACK 5b59a19731

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MarcoFalke 2020-03-18 14:02:20 -04:00
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2
src/consensus/merkle.cpp
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@ -10,7 +10,7 @@
that the following merkle tree algorithm has a serious flaw related to
duplicate txids, resulting in a vulnerability (CVE-2012-2459).
The reason is that if the number of hashes in the list at a given time
The reason is that if the number of hashes in the list at a given level
is odd, the last one is duplicated before computing the next level (which
is unusual in Merkle trees). This results in certain sequences of
transactions leading to the same merkle root. For example, these two