blockchain: refactor code to separate out accumulator verification and modification #202
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Take out verification from process udata as we were performing verification and modification in the same function. Separating these out make it possible to keep the utreexo state in case signature verification fails.
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The accumulator verification and modification was being done in a single function. This meant that if the accumulator verification passed while signature validation failed, the node would be left at an inconsistent state. The change here prevents that from being possible.